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Quantum Space: Loop Quantum Gravity and the Search for the Structure of Space, Time, and the Universe
Combining clear discussions of both quantum theory and general relativity, this book offers one of the first efforts to explain the new quantum theory of space and time.
Today we are blessed with two extraordinarily successful theories of physics. The first is Albert Einstein's general theory of relativity, which describes the large-scale behaviour of matter in a curved spacetime. This theory is the basis for the standard model of big bang cosmology. The discovery of gravitational waves at the LIGO observatory in the US (and then Virgo, in Italy) is only the most recent of this theory's many triumphs.
The second is quantum mechanics. This theory describes the properties and behaviour of matter and radiation at their smallest scales. It is the basis for the standard model of particle physics, which builds up all the visible constituents of the universe out of collections of quarks, electrons and force-carrying particles such as photons. The discovery of the Higgs boson at CERN in Geneva is only the most recent of this theory's many triumphs.
But, while they are both highly successful, these two structures leave a lot of important questions unanswered. They are also based on two different interpretations of space and time, and are therefore fundamentally incompatible. We have two descriptions but, as far as we know, we've only ever had one universe. What we need is a quantum theory of gravity.
Approaches to formulating such a theory have primarily followed two paths. One leads to String Theory, which has for long been fashionable, and about which much has been written. But String Theory has become mired in problems. In this book, Jim Baggott describes "the road less travelled": an approach which takes relativity as its starting point, and leads to a structure called Loop Quantum Gravity. Baggott tells the story through the careers and pioneering work of two of the theory's most prominent contributors, Lee Smolin and Carlo Rovelli.
Today we are blessed with two extraordinarily successful theories of physics. The first is Albert Einstein's general theory of relativity, which describes the large-scale behaviour of matter in a curved spacetime. This theory is the basis for the standard model of big bang cosmology. The discovery of gravitational waves at the LIGO observatory in the US (and then Virgo, in Italy) is only the most recent of this theory's many triumphs.
The second is quantum mechanics. This theory describes the properties and behaviour of matter and radiation at their smallest scales. It is the basis for the standard model of particle physics, which builds up all the visible constituents of the universe out of collections of quarks, electrons and force-carrying particles such as photons. The discovery of the Higgs boson at CERN in Geneva is only the most recent of this theory's many triumphs.
But, while they are both highly successful, these two structures leave a lot of important questions unanswered. They are also based on two different interpretations of space and time, and are therefore fundamentally incompatible. We have two descriptions but, as far as we know, we've only ever had one universe. What we need is a quantum theory of gravity.
Approaches to formulating such a theory have primarily followed two paths. One leads to String Theory, which has for long been fashionable, and about which much has been written. But String Theory has become mired in problems. In this book, Jim Baggott describes "the road less travelled": an approach which takes relativity as its starting point, and leads to a structure called Loop Quantum Gravity. Baggott tells the story through the careers and pioneering work of two of the theory's most prominent contributors, Lee Smolin and Carlo Rovelli.
448 pages, Hardcover
First published January 22, 2019
183 people are currently reading
1044 people want to read
About the author
Jim Baggott
23 books147 followersJim Baggott completed his doctorate in physical chemistry at the University of Oxford and his postgraduate research at Stanford University.
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Displaying 1 - 30 of 38 reviews
December 10, 2018
There's no doubt that Jim Baggott is one of the best popular science writers currently active. He specialises in taking really difficult topics and giving a more in-depth look at them than most of his peers. The majority of the time he achieves with a fluid writing style that remains easily readable, though inevitably there are some aspects that are difficult for the readers to get their heads around - and this is certainly true of his latest title Quantum Space, which takes on loop quantum gravity.
As Baggott points out, you could easily think that string theory was the only game in town when it comes to the ultimate challenge in physics, finding a way to unify the currently incompatible general theory of relativity and quantum theory. Between them, these two behemoths of twentieth century physics underlie the vast bulk of physics very well - but they simply can't be put together. String theory (and its big brother M-theory, which as Baggott points out, is not actually a theory at all but simply a conjecture) has had much written about it. But the main alternative theory, loop quantum gravity has had far less coverage. As I mentioned in another review (and Baggott also picks this up), in one whole book on gravity, loop quantum gravity is only mentioning in an endnote. Yet in many ways, loop quantum gravity has a lot more going for it than string theory.
One major strand of Quantum Space is a biography of two key players in the field - Lee Smolin and Carlo Rovelli, both good writers for the general public in their own right, but neither has been able to come close to what Baggott does in trying to make the ideas of loop quantum gravity accessible at a deeper level than a summary, hand-waving description. It’s also the first complete and approachable account I’ve seen of how both approaches to a quantum theory of gravity were derived. The only downside of the way it's structured is that I think if you’re going to be comfortable with the level of detail Baggott gives, you probably don’t need the first 100 pages or so giving background on quantum theory and general relativity.
My only real concern apart from that unnecessary opening material, which makes the book a little too long for my tastes, is that there could have been more unpacking of how loop quantum gravity represents reality - the jump from the introduction of spin networks to anything resembling a theory that can be applied to a real world where things happen is overwhelming. I had to resort to the much valued advice of one of my supervisors at university who said 'Don't worry if it doesn't all make sense, just keep on with it and hopefully it will all come together.' It almost all did all come together, but I was left with a nagging doubt that I couldn't really grasp the foundation of the whole idea.
As well as coming out of reading this book with significantly more respect for Rovelli (whose popular science writing I find flowery and overrated), I feel that Baggott has done a huge favour for anyone who really wants to understand modern theoretical physics, giving a much better understanding of this fascinating attempt to deal with a central requirement to explain the workings of our universe. It's a triumph.
As Baggott points out, you could easily think that string theory was the only game in town when it comes to the ultimate challenge in physics, finding a way to unify the currently incompatible general theory of relativity and quantum theory. Between them, these two behemoths of twentieth century physics underlie the vast bulk of physics very well - but they simply can't be put together. String theory (and its big brother M-theory, which as Baggott points out, is not actually a theory at all but simply a conjecture) has had much written about it. But the main alternative theory, loop quantum gravity has had far less coverage. As I mentioned in another review (and Baggott also picks this up), in one whole book on gravity, loop quantum gravity is only mentioning in an endnote. Yet in many ways, loop quantum gravity has a lot more going for it than string theory.
One major strand of Quantum Space is a biography of two key players in the field - Lee Smolin and Carlo Rovelli, both good writers for the general public in their own right, but neither has been able to come close to what Baggott does in trying to make the ideas of loop quantum gravity accessible at a deeper level than a summary, hand-waving description. It’s also the first complete and approachable account I’ve seen of how both approaches to a quantum theory of gravity were derived. The only downside of the way it's structured is that I think if you’re going to be comfortable with the level of detail Baggott gives, you probably don’t need the first 100 pages or so giving background on quantum theory and general relativity.
My only real concern apart from that unnecessary opening material, which makes the book a little too long for my tastes, is that there could have been more unpacking of how loop quantum gravity represents reality - the jump from the introduction of spin networks to anything resembling a theory that can be applied to a real world where things happen is overwhelming. I had to resort to the much valued advice of one of my supervisors at university who said 'Don't worry if it doesn't all make sense, just keep on with it and hopefully it will all come together.' It almost all did all come together, but I was left with a nagging doubt that I couldn't really grasp the foundation of the whole idea.
As well as coming out of reading this book with significantly more respect for Rovelli (whose popular science writing I find flowery and overrated), I feel that Baggott has done a huge favour for anyone who really wants to understand modern theoretical physics, giving a much better understanding of this fascinating attempt to deal with a central requirement to explain the workings of our universe. It's a triumph.
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December 1, 2020Baggott achieved quite a feat in being able to explain loop quantum gravity better than both of the theory's founders. In the past, deciphering Lee Smolin books has been a challenge for me. I always end up getting the gist but never gaining the deeper understanding I initially set as my goal. When I read Rovelli, I am in a constant state of awe, but I always hope for more detail, which never comes. Jim Baggott was able to reach a middle ground between Rovelli and Smolin, infusing fact with just the right amount of awe to allow the reader to absorb the information while still riding that high gained from uncovering the secrets of the universe.
Baggott masterfully outlined the timeline for research into loop quantum gravity. In doing so, he gave the reader a glimpse into the personal lives of both Smolin and Rovelli, while slowly introducing us to their thought processes that gave rise to the current concept of loop quantum gravity. Physicists have not yet found a way to unify Einstein's general theory of relativity and quantum theory. String theory might have looked like our best bet, but it kept ramming against inconvenient limitations that took some mathematical gymnastics to overcome. In arguing that LQG is a better contender to unify both theories, Baggott discussed relevant ideas from string theory and M Theory, showing how innovative some of the thinking was, while at the same time, showing how LQG could overcome many of string theory's limitations.
Baggott introduced the reader to many of the usual suspects: Abhay Ashtekar, John Wheeler, Stephen Hawking and Jacob Bekenstein, etc, but it really felt like a wholly different way than they had been introduced in the lectures and books I have tackled before. Baggott's writing style is so clear, I wish I had been able to read his account of black hole entropy years ago when I poured over each letter in the equation, trying so hard to understand what it all meant. I remember trying to understand black hole radiation, information, and the holographic principle in a very disjointed way, missing so many connections. If I had had this book to read along while watching lectures and reading papers, everything would have made so much more sense to me. It made me wish that Baggott wrote a book on ER = EPR. Right now I am focused on that and learning it in sort of disjointed pieces. I would love a Jim Baggott type of writer to come along and lay it all plain for me.
Baggott masterfully outlined the timeline for research into loop quantum gravity. In doing so, he gave the reader a glimpse into the personal lives of both Smolin and Rovelli, while slowly introducing us to their thought processes that gave rise to the current concept of loop quantum gravity. Physicists have not yet found a way to unify Einstein's general theory of relativity and quantum theory. String theory might have looked like our best bet, but it kept ramming against inconvenient limitations that took some mathematical gymnastics to overcome. In arguing that LQG is a better contender to unify both theories, Baggott discussed relevant ideas from string theory and M Theory, showing how innovative some of the thinking was, while at the same time, showing how LQG could overcome many of string theory's limitations.
Baggott introduced the reader to many of the usual suspects: Abhay Ashtekar, John Wheeler, Stephen Hawking and Jacob Bekenstein, etc, but it really felt like a wholly different way than they had been introduced in the lectures and books I have tackled before. Baggott's writing style is so clear, I wish I had been able to read his account of black hole entropy years ago when I poured over each letter in the equation, trying so hard to understand what it all meant. I remember trying to understand black hole radiation, information, and the holographic principle in a very disjointed way, missing so many connections. If I had had this book to read along while watching lectures and reading papers, everything would have made so much more sense to me. It made me wish that Baggott wrote a book on ER = EPR. Right now I am focused on that and learning it in sort of disjointed pieces. I would love a Jim Baggott type of writer to come along and lay it all plain for me.
March 4, 2019
While there have been many works that have probed the more counter-intuitive and mind-bending notions from string theory, very few books have tackled the other major theory describing that most important of current issues in theoretical physics, namely Loop Quantum Gravity (LQG). As he has for numerous other subjects, Jim Baggott provides a very readable introduction and sufficient context to approach this theory for the layman.
The two major figures associated with this theory are also well-published, those being Lee Smolin and Carlo Rovelli. Having read their works I have to say this is a pleasing middle-ground representation (and it was written in consultation with both of them). Where Smolin tends to be a bit long-winded and uses language that is beyond the reach of most enthusiasts in the field, Rovelli's work has seemed to me to be far too flowery and poetic without getting to the real issue at hand. Neither of these critiques could be leveled at Jim Baggott's volume on the subject.
Resolving the issue of quantum gravity through the linkage of General Relativity (the theory of the large where matter tells spacetime how to curve, and curved spacetime tells matter how to move) and Quantum Mechanics (the workings of the smallest divisions in the subatomic world) has led to many theories and as aforementioned, most of the published volumes have been dealing with string theory. Admittedly, at least to the layman, string theory is much more interesting in that it requires you to contemplate infinitesimally small vibrating strings and 10 spacetime dimensions (or 11 when considering M-theory) and tiny bound dimensions wrapped up in Calabi-Yau shapes. However, the lack of predictions and testability of this theory has come under increased scrutiny in recent years despite its mathematical success. LQG is quantum gravity that essentially predicts quanta of area and volume of space at the square and cube of the Planck length. LQG is the most well-developed of the competing theories and in fact in recent years has sparked some debate as to whether or not it could effectively be combined with notions from string theory.
While this may not be the best starting point if you are unaware of these competing theories (that can be found in the work of Brian Greene, even though string theory gets the spotlight in his works), Baggott's deft introduction to this subject should hopefully lead you to further study from Smolin (Rovelli is a brilliant physicist, but his published works for the layman are somewhat lacking, at least in my opinion). Also, Baggott is kind enough to provide a large glossary at the end of this volume that is particularly important given the use of several new or underdeveloped concepts upon which this theory (LQG) depends.
The two major figures associated with this theory are also well-published, those being Lee Smolin and Carlo Rovelli. Having read their works I have to say this is a pleasing middle-ground representation (and it was written in consultation with both of them). Where Smolin tends to be a bit long-winded and uses language that is beyond the reach of most enthusiasts in the field, Rovelli's work has seemed to me to be far too flowery and poetic without getting to the real issue at hand. Neither of these critiques could be leveled at Jim Baggott's volume on the subject.
Resolving the issue of quantum gravity through the linkage of General Relativity (the theory of the large where matter tells spacetime how to curve, and curved spacetime tells matter how to move) and Quantum Mechanics (the workings of the smallest divisions in the subatomic world) has led to many theories and as aforementioned, most of the published volumes have been dealing with string theory. Admittedly, at least to the layman, string theory is much more interesting in that it requires you to contemplate infinitesimally small vibrating strings and 10 spacetime dimensions (or 11 when considering M-theory) and tiny bound dimensions wrapped up in Calabi-Yau shapes. However, the lack of predictions and testability of this theory has come under increased scrutiny in recent years despite its mathematical success. LQG is quantum gravity that essentially predicts quanta of area and volume of space at the square and cube of the Planck length. LQG is the most well-developed of the competing theories and in fact in recent years has sparked some debate as to whether or not it could effectively be combined with notions from string theory.
While this may not be the best starting point if you are unaware of these competing theories (that can be found in the work of Brian Greene, even though string theory gets the spotlight in his works), Baggott's deft introduction to this subject should hopefully lead you to further study from Smolin (Rovelli is a brilliant physicist, but his published works for the layman are somewhat lacking, at least in my opinion). Also, Baggott is kind enough to provide a large glossary at the end of this volume that is particularly important given the use of several new or underdeveloped concepts upon which this theory (LQG) depends.
June 30, 2024
This is the first physics book I've read that includes Pippin riding on Shadowfax as an example!
Jim Baggott tells the story of the development of Loop Quantum Gravity (the alternative hypothesis to String Theory), starting from Albert Einstein's general theory of relativity (which describes the large-scale behaviour of matter in a curved spacetime) and the standard model of quantum mechanics, which describes the properties and behaviour of matter and radiation at their smallest scales. Quantum mechanics is the basis for the standard model of particle physics, which builds up all the visible constituents of the universe out of collections of quarks, electrons and force-carrying particles such as photons and the recently validated Higgs boson. However, these two theories – the Standard Model of Quantum Physics and General Relativity – are mutually incompatible. Loop Quantum Gravity is currently the best theory available of quantum gravity, which aims to reconcile quantum mechanics and general relativity. This relatively new quantum theory of space and time is told through the careers and pioneering work of two of the theory's most prominent contributors, Lee Smolin and Carlo Rovelli.
An interesting and well presented book, but I think I need more illustrations... (or a better (quantum) brain to wrap my mind around some of this stuff?)
A Short YOUTUBE Video on Loop Quantum Gravity: https://www.youtube.com/watch?v=L2suM...
Jim Baggott tells the story of the development of Loop Quantum Gravity (the alternative hypothesis to String Theory), starting from Albert Einstein's general theory of relativity (which describes the large-scale behaviour of matter in a curved spacetime) and the standard model of quantum mechanics, which describes the properties and behaviour of matter and radiation at their smallest scales. Quantum mechanics is the basis for the standard model of particle physics, which builds up all the visible constituents of the universe out of collections of quarks, electrons and force-carrying particles such as photons and the recently validated Higgs boson. However, these two theories – the Standard Model of Quantum Physics and General Relativity – are mutually incompatible. Loop Quantum Gravity is currently the best theory available of quantum gravity, which aims to reconcile quantum mechanics and general relativity. This relatively new quantum theory of space and time is told through the careers and pioneering work of two of the theory's most prominent contributors, Lee Smolin and Carlo Rovelli.
An interesting and well presented book, but I think I need more illustrations... (or a better (quantum) brain to wrap my mind around some of this stuff?)
A Short YOUTUBE Video on Loop Quantum Gravity: https://www.youtube.com/watch?v=L2suM...
June 28, 2020
Reality is what it is. One day, we will figure out if fundamentally, it is more in line with what loop quantum gravity posits, or what string- or some versions of M-theory say it is, or something totally different. For the folks of this generation, chances are quite high that this question remains unresolved. The best the non-scientists can hope for are books on various proposals that keep explaining what these theories imply, the latest achievements in the work/explanations, and the path ahead.
"Quantum Space" is one in a string (!) of books on the loop quantum gravity theory with a lot of value for interested readers at this point. It is incomplete and unresolved, like the underlying theory. Its explanations are partial, often mindbogglingly complex, and speculative like the theory it discusses. The author nearly overlooks discussions on where it could be wrong or the genuine reasons why many more are drawn away from it to the competing explanation, just like the fans of the string versions in the way they ignore LQG.
Casual readers who want to develop a good understanding of potentially unifying scientific theories will need to read many books that try to explain this from some particular viewpoint. Quantum Space will be a good member of any such collection of a few dozens. The author is passionate about LQG, has some great explanations of difficult concepts, and embellishes the book with the real-life stories of the founders of the field.
"Quantum Space" is one in a string (!) of books on the loop quantum gravity theory with a lot of value for interested readers at this point. It is incomplete and unresolved, like the underlying theory. Its explanations are partial, often mindbogglingly complex, and speculative like the theory it discusses. The author nearly overlooks discussions on where it could be wrong or the genuine reasons why many more are drawn away from it to the competing explanation, just like the fans of the string versions in the way they ignore LQG.
Casual readers who want to develop a good understanding of potentially unifying scientific theories will need to read many books that try to explain this from some particular viewpoint. Quantum Space will be a good member of any such collection of a few dozens. The author is passionate about LQG, has some great explanations of difficult concepts, and embellishes the book with the real-life stories of the founders of the field.
December 2, 2018
3.5 stars. This books tells the story of the development of Loop Quantum Gravity, a theory that explains the emergence of discrete spacetime.
At the beginning the history of relativity and quantum mechanics was well told. Several parts describing string theory and LQG were kind of obscure and may have needed special clarification, e.g., the explanation of the emergence of time from spinfoam could have used a few more time to describe its process. Also the order of some paragraphs was a bit confusing, jumping from one topic to another.
One of the things I liked the most was that this was not only the story of a scientific development, but the story of people trying to develop a theory of quantum gravity, including personal relations, problems, etc.
Overall I enjoyed this book, but I don't think it is an easy read. I'd recommend it if you have some knowledge of modern physics.
At the beginning the history of relativity and quantum mechanics was well told. Several parts describing string theory and LQG were kind of obscure and may have needed special clarification, e.g., the explanation of the emergence of time from spinfoam could have used a few more time to describe its process. Also the order of some paragraphs was a bit confusing, jumping from one topic to another.
One of the things I liked the most was that this was not only the story of a scientific development, but the story of people trying to develop a theory of quantum gravity, including personal relations, problems, etc.
Overall I enjoyed this book, but I don't think it is an easy read. I'd recommend it if you have some knowledge of modern physics.
August 7, 2020
This is the most understandable book on physics that gets deep into the subject that I have read. Baggott starts off with the standard explanation of current state of the subject from the Greeks to the present that appears in every book about physics. Einstein and General Relativity and Quantum Mechanics how they don’t fit together, but both have practical applications etc. His explanations of these theories are well written and understandable to the layman.
Then it’s time to get into Loop Quantum Gravity (LQG). Here I was hoping for some new insight or information as to how this approach which differs somewhat from String Theory is progressing. I read Smolin’s The Trouble With Physics earlier this year and didn’t find anything new of the subject here.
Now if you are interested in LQG this is an excellent book and I would recommend it over Smolin. The concepts are more clearly explained in this book. It’s also a good first read for anyone interested in Cosmology as well.
There is a lot that we don’t know about our universe and it appears we need to develop better technologies to advance that knowledge and test the theories that have been proposed.
Then it’s time to get into Loop Quantum Gravity (LQG). Here I was hoping for some new insight or information as to how this approach which differs somewhat from String Theory is progressing. I read Smolin’s The Trouble With Physics earlier this year and didn’t find anything new of the subject here.
Now if you are interested in LQG this is an excellent book and I would recommend it over Smolin. The concepts are more clearly explained in this book. It’s also a good first read for anyone interested in Cosmology as well.
There is a lot that we don’t know about our universe and it appears we need to develop better technologies to advance that knowledge and test the theories that have been proposed.
January 6, 2019
This was my first book of 2019 and I devoured it in the week I took off after Christmas. Quantum Space is an overview of Loop Quantum Gravity (LQG), which is the main contender to String Theory for a quantum theory of gravity. As with most of these books you get a brief recap/101 on general relativity, quantum mechanics, quantum field theory and other relevant areas of physics. The book then starts to introduce the ideas leading to the development of LQG (and occasionally compares/contrasts with string theory along the way) and finally covers potential implications of the theory. Personally I found the book fascinating and a bit of a nostalgia trip in places [1]. It's not an easy read as the book progresses, and I'll probably need to re-read some sections to get a better grasp of what's really going on. I'm not sure if this is a book for the layperson, and some background in maths/physics will no doubt help [1]. That said, I think it did for LQG what Brian Greene's Elegant Universe did for String Theory.
[1] I always feel I have to do a disclaimer on reviewing books like this. I studied a lot of relevant background material to this book for several years. My degree was in maths (with plenty of theoretical physics). I did a masters covering subjects like relativity, quantum fields theory, quantum cosmology, particle physics and black holes. I then went on to do a PhD in relativity.
[1] I always feel I have to do a disclaimer on reviewing books like this. I studied a lot of relevant background material to this book for several years. My degree was in maths (with plenty of theoretical physics). I did a masters covering subjects like relativity, quantum fields theory, quantum cosmology, particle physics and black holes. I then went on to do a PhD in relativity.
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January 20, 2019Nature mini-review, by Barbara Kiser https://www.nature.com/articles/d4158...
"Prolific physics writer Jim Baggott is back with a terrific page-turner on loop quantum gravity (LQG) — the theory posited as a solution to that chasm in physics between quantum mechanics and the general theory of relativity. Baggott digs into the how and why of what LQG might reveal about “space, time and the universe”, tracing its evolution through the work of Abhay Ashtekar, Lee Smolin, Carlo Rovelli and others, to its current implications for, say, the physics of black holes. Baggott masterfully tenderizes the scientific chewiness and is careful not to over-egg what is, after all, a work in progress."
"Prolific physics writer Jim Baggott is back with a terrific page-turner on loop quantum gravity (LQG) — the theory posited as a solution to that chasm in physics between quantum mechanics and the general theory of relativity. Baggott digs into the how and why of what LQG might reveal about “space, time and the universe”, tracing its evolution through the work of Abhay Ashtekar, Lee Smolin, Carlo Rovelli and others, to its current implications for, say, the physics of black holes. Baggott masterfully tenderizes the scientific chewiness and is careful not to over-egg what is, after all, a work in progress."
May 16, 2020
Contrarian views in science are always captivating, those pose discomforting questions for the mainstream for the benefit of her majesty Science. Knew about Lee Smolin, thanks to this book learned that Carlo Rovelli is also a LQG proponent, and learned several new names in LGQ - Abhay Ashtekar, they all are brave fellows.
April 25, 2019
If you need a book on loop quantum gravity to balance out all those books on string theory out there, this is a good choice.
May 28, 2020
I’m glad I read Rovelli first because he goes deeper into things, with a singleness of focus, but this book has other depths and gives a good overview of the field, too. On rereading, I find more depths and entrances to areas unknown to me.
July 22, 2019
I got the feeling this book did not know what it wanted to go for. On the one side, it scribbled the lives of its protagonists too far away for a biography, on the other side it concentrated way too much on people for introducing a congruent theory. If it wanted to go for content, I found the personal stuff distracting. I realize that the author had no easy task as this theory is still in its infancy, but maybe it was not the right time for this book then
May 26, 2019
A very nice, semi-biographical physics book that presents the story of Loop Quantum Gravity and its protagonists in an inspiring read. Although the opening background chapters are a bit uncritical of the standard orthodoxy, I like the way more recent physics is held to account. This was a page turner!
July 9, 2023
“Quantum Space” by Jim Baggott is a book that explores the theory of Loop Quantum Gravity (LQG) and its potential to unify general relativity with quantum mechanics. The book follows the careers of three key pioneers in the field, Smolin, Ashketar, and Rovelli, with a focus on Smolin and Rovelli.
As an avid reader and science enthusiast, I found myself utterly immersed in the author's eloquent storytelling and deeply engrossed in the mind-bending concepts that he elucidates with remarkable clarity.
The author, Jim Baggott, is a chemist by training but has a strong history of writing science for a general audience. He takes an empirical view of physics and is skeptical of some modern physics explorations that seem to be pure mathematical exercises without actual predictions.
Baggott's exceptional ability to distill complex scientific ideas into accessible language is evident throughout the book. He expertly guides listeners through the labyrinthine landscape of quantum physics, unraveling its mysterious principles and uncovering the fascinating implications they hold for our understanding of the universe. With an authoritative yet engaging tone, the author brings forth the awe-inspiring wonders and the mind-boggling paradoxes that lie at the heart of quantum mechanics.
One of the book's greatest strengths is its meticulous attention to detail. Baggott provides a comprehensive historical backdrop, tracing the evolution of quantum physics from its early beginnings to its present-day frontiers. By delving into the pioneering experiments and the brilliant minds behind them, he contextualizes the concepts, making them more tangible and relatable for listeners. This historical narrative not only enhances our appreciation for the scientific endeavor but also highlights the human stories intertwined with the quest to understand the fundamental nature of reality.
Throughout the book, Baggott masterfully interweaves scientific explanations with vivid analogies and thought-provoking metaphors. His ability to illuminate abstract concepts through relatable examples creates a bridge between the quantum world and our everyday experiences. Whether comparing quantum superposition to Schrödinger's famous cat or exploring the mind-bending concept of quantum entanglement through the lens of a celestial dance, Baggott's metaphors provide powerful visualizations that aid in comprehending the counterintuitive nature of quantum phenomena.
Furthermore, Baggott thoughtfully explores the philosophical implications of quantum physics, delving into the age-old debate between determinism and indeterminism. He encourages listeners to ponder the nature of free will and the existence of a hidden reality beyond our current understanding. These philosophical musings add an extra layer of depth to the audiobook, prompting introspection and raising profound questions about the nature of our existence.
In addition to its scientific and philosophical insights, "Quantum Space" also sheds light on the collaborative nature of scientific discovery. Baggott emphasizes the importance of collaboration and the exchange of ideas, showcasing how scientists from different disciplines come together to unravel the mysteries of the universe. This depiction of the scientific community as a collective endeavor serves as a powerful reminder of the interconnectedness of human knowledge and the importance of interdisciplinary approaches.
While the book is rich in scientific content, it remains accessible to both scientific novices and seasoned enthusiasts alike. Baggott's clear and concise explanations, coupled with the narrator's engaging delivery, make even the most intricate concepts comprehensible and engaging. The pacing of the audiobook is well-suited, allowing listeners to absorb the information without feeling overwhelmed, while also maintaining a sense of excitement and curiosity.
In conclusion, "Quantum Space" is an exceptional book that takes listeners on a mind-expanding journey into the depths of the quantum world. Jim Baggott's brilliant storytelling, combined with his ability to demystify complex scientific concepts, creates an immersive and intellectually stimulating experience. This book serves as a gateway to understanding the profound implications of quantum physics and the awe-inspiring wonders that lie within our universe. Whether you are a science enthusiast or simply curious about the mysteries of the quantum realm, "Quantum Space" is a must-listen that will leave you pondering the nature of reality long after the final chapter concludes.
As an avid reader and science enthusiast, I found myself utterly immersed in the author's eloquent storytelling and deeply engrossed in the mind-bending concepts that he elucidates with remarkable clarity.
The author, Jim Baggott, is a chemist by training but has a strong history of writing science for a general audience. He takes an empirical view of physics and is skeptical of some modern physics explorations that seem to be pure mathematical exercises without actual predictions.
Baggott's exceptional ability to distill complex scientific ideas into accessible language is evident throughout the book. He expertly guides listeners through the labyrinthine landscape of quantum physics, unraveling its mysterious principles and uncovering the fascinating implications they hold for our understanding of the universe. With an authoritative yet engaging tone, the author brings forth the awe-inspiring wonders and the mind-boggling paradoxes that lie at the heart of quantum mechanics.
One of the book's greatest strengths is its meticulous attention to detail. Baggott provides a comprehensive historical backdrop, tracing the evolution of quantum physics from its early beginnings to its present-day frontiers. By delving into the pioneering experiments and the brilliant minds behind them, he contextualizes the concepts, making them more tangible and relatable for listeners. This historical narrative not only enhances our appreciation for the scientific endeavor but also highlights the human stories intertwined with the quest to understand the fundamental nature of reality.
Throughout the book, Baggott masterfully interweaves scientific explanations with vivid analogies and thought-provoking metaphors. His ability to illuminate abstract concepts through relatable examples creates a bridge between the quantum world and our everyday experiences. Whether comparing quantum superposition to Schrödinger's famous cat or exploring the mind-bending concept of quantum entanglement through the lens of a celestial dance, Baggott's metaphors provide powerful visualizations that aid in comprehending the counterintuitive nature of quantum phenomena.
Furthermore, Baggott thoughtfully explores the philosophical implications of quantum physics, delving into the age-old debate between determinism and indeterminism. He encourages listeners to ponder the nature of free will and the existence of a hidden reality beyond our current understanding. These philosophical musings add an extra layer of depth to the audiobook, prompting introspection and raising profound questions about the nature of our existence.
In addition to its scientific and philosophical insights, "Quantum Space" also sheds light on the collaborative nature of scientific discovery. Baggott emphasizes the importance of collaboration and the exchange of ideas, showcasing how scientists from different disciplines come together to unravel the mysteries of the universe. This depiction of the scientific community as a collective endeavor serves as a powerful reminder of the interconnectedness of human knowledge and the importance of interdisciplinary approaches.
While the book is rich in scientific content, it remains accessible to both scientific novices and seasoned enthusiasts alike. Baggott's clear and concise explanations, coupled with the narrator's engaging delivery, make even the most intricate concepts comprehensible and engaging. The pacing of the audiobook is well-suited, allowing listeners to absorb the information without feeling overwhelmed, while also maintaining a sense of excitement and curiosity.
In conclusion, "Quantum Space" is an exceptional book that takes listeners on a mind-expanding journey into the depths of the quantum world. Jim Baggott's brilliant storytelling, combined with his ability to demystify complex scientific concepts, creates an immersive and intellectually stimulating experience. This book serves as a gateway to understanding the profound implications of quantum physics and the awe-inspiring wonders that lie within our universe. Whether you are a science enthusiast or simply curious about the mysteries of the quantum realm, "Quantum Space" is a must-listen that will leave you pondering the nature of reality long after the final chapter concludes.
April 16, 2021
I recently came across a lynch mob on twitter that was putting Neal Degrasse Tyson through the coals for the crime of getting wrong some facts on one of the theories of how the universe will end and I felt sorry for him. Physics is so wide and its research areas expansive that unless you are a practitioner of that line of research you are bound to rile some feathers with your comments. It's a good thing am not NDT, although in the mob's defence someone pointed out that Professor Brian Cox is not guilty of this so maybe NDT should consider doing a lot more background research before appearing on TV.
I read this book as a refresher on LQG and some terms on quantum fields and on those grounds I got what I came for. I've read Jim Baggott's books before and I know his writing is exhaustive and he never gets caught up in visual approximations, he tells you the science as is and trusts that the fact that you bought this book, you are tenacious enough to research things which you are unfamiliar with.
Loop Quantum Gravity does not excite me the same way Pilot Wave does but at least it does not invent extra dimensions any time the math doesn't add it up. It is the most grounded theory and tries to hew closely to classical relativity but it also falls under speculative science; science with no experimental backing. I feel like this science should not stand at the same podium with science like the mRNA research that has led to development of COVID 19 vaccines. One has applied real world effects while the other could be a candidate theory to our age's phlogiston theory. Not the same...
Still, humanity's quest for answers is eternal and the search brought us to the Planck's scale and left us to argue and deliberately confuse ourselves. We soldier on nonetheless. Highly recommended to anyone interested in Loop Quantum Gravity.
I read this book as a refresher on LQG and some terms on quantum fields and on those grounds I got what I came for. I've read Jim Baggott's books before and I know his writing is exhaustive and he never gets caught up in visual approximations, he tells you the science as is and trusts that the fact that you bought this book, you are tenacious enough to research things which you are unfamiliar with.
Loop Quantum Gravity does not excite me the same way Pilot Wave does but at least it does not invent extra dimensions any time the math doesn't add it up. It is the most grounded theory and tries to hew closely to classical relativity but it also falls under speculative science; science with no experimental backing. I feel like this science should not stand at the same podium with science like the mRNA research that has led to development of COVID 19 vaccines. One has applied real world effects while the other could be a candidate theory to our age's phlogiston theory. Not the same...
Still, humanity's quest for answers is eternal and the search brought us to the Planck's scale and left us to argue and deliberately confuse ourselves. We soldier on nonetheless. Highly recommended to anyone interested in Loop Quantum Gravity.
September 8, 2021
Very comprehensive overview of Quantum theory, where we’re at today and how we arrived here with the various competing theories and what this means in terms of reality and the origins of our Universe.
I listened to this on Audible, which can mean I don’t always follow at the best of times, as your typically less immersed when listening versus reading a book. However, that was occasionally amplified due to the subject matter, which can be heavy going at times though Jim has done his best to simplify a difficult topic.
One of the big conclusions, which is a criticism Eric Weinstein levels at theoretical physics, is that we haven’t really moved the needle a particularly long way in the last 50 years. We’ve sort of stagnated and haven’t discovered anything too radical. A Renaissance and a new injection of fresh blood and ideas is required.
It appears as though the more we think we know, the less we know. “The great world of theories” the author mentions seems to be the best explanation, as theorists appear to be going around in circles and coming back to the same questions with no likelihood of an answer.
Quantum theory is manifestly incomplete. The question remains how it should be completed.
I listened to this on Audible, which can mean I don’t always follow at the best of times, as your typically less immersed when listening versus reading a book. However, that was occasionally amplified due to the subject matter, which can be heavy going at times though Jim has done his best to simplify a difficult topic.
One of the big conclusions, which is a criticism Eric Weinstein levels at theoretical physics, is that we haven’t really moved the needle a particularly long way in the last 50 years. We’ve sort of stagnated and haven’t discovered anything too radical. A Renaissance and a new injection of fresh blood and ideas is required.
It appears as though the more we think we know, the less we know. “The great world of theories” the author mentions seems to be the best explanation, as theorists appear to be going around in circles and coming back to the same questions with no likelihood of an answer.
Quantum theory is manifestly incomplete. The question remains how it should be completed.
October 10, 2019
Baggott is a very good writer. In this book he wrote about a vexing problem in physics - the impossibility of reconciling quantum physics and relativity. Quantum physics assumes locality, or fixed time space. Relativity stated that time-space is affected by gravity. However neither theory can explain everything.
The new idea is called Loop Quantum Gravity. Many models have been tried, such as the string theory and super-symmetry, all to try to perfect the solution. However proof for these are hard to come by. Loop Quantum Gravity explained that time-space does not exist in continuity but in quantum. The newest model consists ‘bubble foam’ with possible worm holes for fundamental particles to loop upon themselves. That is, if I have understood correctly.
We are still trying to understand the universe by finding a theory of everything, but we might just have reached an impasse where no further proof is possible from scientific experiments.
The new idea is called Loop Quantum Gravity. Many models have been tried, such as the string theory and super-symmetry, all to try to perfect the solution. However proof for these are hard to come by. Loop Quantum Gravity explained that time-space does not exist in continuity but in quantum. The newest model consists ‘bubble foam’ with possible worm holes for fundamental particles to loop upon themselves. That is, if I have understood correctly.
We are still trying to understand the universe by finding a theory of everything, but we might just have reached an impasse where no further proof is possible from scientific experiments.
June 30, 2019
The first clear popular science account of Loop Quantum Gravity (LQG) I have read. And it is about time (no pun intended). As with the funding, most popular accounts of particle physics at this scale is about string theory, so this was a very welcome addition to the literature. Quantum Space is a clear semi historical accouunt of LQG that shows how attempts were made to form a quantum theory of gravity starting from general relativity (as apposed to string theory that had its starting point quantum mechanics). Jim Baggot writes in a clear logical style that builds understanding of the field step by step. It flows nicely. I would reccomend this for anyone interested in particle physics and cosmology whatever their background. I would particularly reccomend it to A level Physics students (although you in no way need to have that level of understanding to enjoy this book).
August 23, 2022
There are books on science that are fun to read but lacking in accuracy and most of the remainder are accurate but almost unreadable. This book is fortunately an exception. I went through it in a couple of days reassured by its coverage of Newton, Einstein, and basic Quantum Mechanics and thus willing to accept its String Theory and Loop Quantum Gravity and Cosmology. I now know, or think I know, what the big bounce theory is about. And my to do list now includes a wiki revision of Plank's constant. I should know this but I don't.
This is an excellent book written to exactly my level of understanding. (Another item for my to do list; find out what else Jim Baggott has written.)
This is an excellent book written to exactly my level of understanding. (Another item for my to do list; find out what else Jim Baggott has written.)
June 18, 2021
An interesting read if you have the background knowledge to follow along. I would recommend this book to someone who has studied some college level physics and who has also read a bit about string theory and relativity. There are no calculations in the book which simultaneous makes it more accessible and also a bit confusing as I felt some of the explanations needed math (although I doubt I would have understood the math if it had been there). For those who love to read about physics, this is a good book.
June 28, 2022
It seems like a good introduction to Quantum Loop Gravity
To do that, it walks through Relativity and Quantum theory. It tries to give credit to the people involved in all of them so is littered with references to people.
QLG is a currently unprovable theory that tries to explain how gravity works in more detail. The problem is that deviations from current theories are small enough that measurements we can do are within the margin of error for either theory.
To do that, it walks through Relativity and Quantum theory. It tries to give credit to the people involved in all of them so is littered with references to people.
QLG is a currently unprovable theory that tries to explain how gravity works in more detail. The problem is that deviations from current theories are small enough that measurements we can do are within the margin of error for either theory.
March 11, 2023
The first half was largely familiar territory to me, but in the second half it got to the more interesting elements of the loop quantum gravity approach. Provides a good introduction to the basic concepts involved and to its genesis as a theory through the work of Smolin and Rovelli, and its precursors in the ideas of Penrose and others.
February 28, 2019
Great insight into LQG and LQC
A great book, fairly easy to read considering the topics in question. A huge collection of bibliography and references for further digging through new physics developments.
A great book, fairly easy to read considering the topics in question. A huge collection of bibliography and references for further digging through new physics developments.
November 4, 2019
The pursuit of quantum gravity
The pursuit of quantum gravity was a establishment defying move. Now string theory is stuck with 10 to the five hundredth power possible solutions,it is time to pay attention to what these guys have been up to.
The pursuit of quantum gravity was a establishment defying move. Now string theory is stuck with 10 to the five hundredth power possible solutions,it is time to pay attention to what these guys have been up to.
December 31, 2019
It is a very good book that will give you an idea of what loop quantum gravity is and where we are in understanding the structure of Space and Time. This book is just the beginning of the road in our understanding of space and time ... but what a road...
March 3, 2020
I think if we can solve those problems where General relativity breaks down, that is, space time singularity, dark matter and the double slit problem. Then we shall have developed the quantum theory of gravity.
June 8, 2020
What a mind exercise! Worth every page, this is a great introduction to some very leading edge theory. It's amazing how far physics has progressed since my last third year class at the UW in 1973. Nice background on Rovelli & Smolin. Fascinating information on loop quantum gravity, spacetime, etc.
July 14, 2024
As always with Baggott's books, it's just fantastic. Not only introduces the reader into fascinating stories of the development of the theory, but also the struggles of Smolin and Rovelli. The author focuses on the most important parts to understand the broad scheme of things. Absolutely great
September 20, 2024
It’s refreshing to find a book on loop quantum gravity, but I must say that while the background material is hold (and I’m quite familiar with), I don’t find that I know much more about LQG after listening to this. But I guess maybe that’s not the intention.
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