When we think of the Theory of Relativity, we have images of an abstract, once-in-a-century, hard-to-understand scientific theory. We look at its creator, Albert Einstein, with awe and reverence. This theory catapulted him to enduring fame, making him a celebrity worldwide. The NY Times reported the event in 1919 with the following headlines: “Einstein’s Theory triumphs. Stars not where they seemed or calculated to be, but nobody need worry”. However, this book shows it was not all that straightforward as we believe it to be. Einstein developed the General Theory of Relativity in 1915, a year into World War I. The war had divided Europe in ways that scarred its people, including the scientific community. Most scientists chose nationalism ahead of the international character of science. Einstein was little known around the world. He was yet to win the Nobel prize. Nor did the Relativity theory stir up the world of Physics even in Germany. German scientists were busy helping its military develop advanced weapons. Besides, Germany did not welcome Einstein’s pacifism and internationalism. Most British scientists responded in a similar nationalistic and patriotic vein. It was in such a polarized context that Einstein proposed the General Theory of Relativity. It was a revolutionary theory that sought to overthrow the 225-year-old Newtonian concepts of space, gravitation, and time with a new framework to understand the Universe. With Britain rallying behind its favorite son, Isaac Newton, there was much resistance to embracing the Relativity theory. However, another pacifist and internationalist in the form of Arthur Eddington saved the day by taking it upon himself to find experimental proof for the General Theory of Relativity. Eddington was an astronomer, physicist, and mathematician. The year 2019 marked the hundredth anniversary of the year when scientists produced the first empirical proof of the General Theory of Relativity. This book by Matthew Stanley is a gripping tale of the years between 1915 and 1919. By the end of the decade, Albert Einstein rose to the dizzy heights of fame we know today.
Many of us may not be familiar with the General Theory of Relativity (referred to as ‘General Relativity’ from hereon). It may be useful to reproduce here a summary of its essence. In 1905, Einstein presented the Special Theory of Relativity, describing space, motion, and time, in sweeping, revolutionary terms. But it did not include a formulation for gravity. He took ten more years to develop General Relativity, which is one of the main pillars of our understanding of the Universe today. This theory explained how galaxies move through space, predicted black holes, and defined the immense scale of the cosmos. It showed that gravity bent light, time dilated and length contracted if you travel closer to the speed of light. General Relativity radically re-fashioned gravity as the effect of the geometry of space-time and Matter and energy as shadows of one another. As a result, we perceive only a distorted image of the true four-dimensional universe. We can grasp the truth of all this reality only through complicated mathematics and philosophical paradoxes.
With such extraordinary propositions, it was no surprise word got around that the number of people who understood General Relativity in the world was in single digits. Arthur Eddington, the premier British astronomer, was one of them. Eddington was born a Quaker and hence was a pacifist and internationalist. With the First World War already ravaging Britain, he became a conscientious objector to the war and resisted the chauvinism of nationalism and patriotism. He became familiar with General Relativity through William de Sitter, a Dutch astronomer working with Einstein. The theory captured Eddington with its beauty and vision and he became its champion in Britain, despite it being an ‘enemy theory’. Soon after the war ended in 1918, he managed two expeditions to Brazil and Principe Island to observe a total solar eclipse. He took photographs of the stars behind the eclipsed sun’s disc to document the effect of the Sun’s gravity on the light coming from these stars. It took months of analysis to check the minuscule deflection of the light. Then, Eddington announced to the world that the light ray was bent over by the small amount Einstein had predicted. The counter-intuitive nature of the bending of light, and the curvature of space-time, made Einstein an overnight celebrity and genius in the eyes of the world.
Author Matthew Stanley writes a gripping account of the struggles of Einstein over ten years to iron out all the problems in his search for General Relativity. Though he did most of his work in Berlin, his friends and fellow-scientists in Berlin, Zurich, and Leiden helped him in this effort, assisting him with the mathematics. However, it was a time of war. There were other pressures on Einstein because of his beliefs. Einstein was a socialist at heart and a pacifist and internationalist to the core. He considered nationalism more dangerous than war. Einstein did not believe God existed either. He wrote in 1915, “I see with dismay that God punishes His children for their folly, for which we can hold Him only responsible. His nonexistence alone can excuse Him”. These beliefs made him take part in opposing the frenzy of war in Germany and fighting for open borders for science. With scientists everywhere embroiled in nationalism, it left Einstein to fight his lone battle. He tried getting the world to know about General Relativity and the experiments that would prove this extraordinary theory.
In his personal life during these years, Einstein separated from his first wife Mileva. He moved in with Elsa, his first cousin in Berlin with whom he was in love. Einstein was a ladies’ man and even had sexual encounters with Ilse, the daughter of Elsa. So much so that Ilse asked him whether he wanted to marry her or her mother. Einstein replied with a disarming ease that he was okay with either! On Valentine’s Day in 1919, Einstein got his divorce from Mileva on the grounds of his adultery with Elsa. Mileva got custody of their sons with a settlement for 8000 francs per annum. Mileva executed a smart settlement by laying claims to the money that Einstein would get if he won a Nobel prize. She was sure that Einstein would get the Nobel Prize! There have been suggestions that Mileva, a physicist herself, and friends Michele Besso and Marcel Grossmann have been part of the genesis of Relativity theory. Author Stanley says that none of them ever claimed credit for the work, and that Special Relativity would have been the same even if they did not involve themselves.
During the First World War, many scientists and sociologists critiqued the conscientious objection of Eddington to the War and Einstein’s pacifism and refusal to support Germany in the War. Stanley examines the proposition that scientists should not get involved with politics, and vice versa. He believes we must acknowledge the political aspects of science so we can understand them. Saying that science and politics are unconnected is to live in illusion. We can find connections between science and democracy and also between science and anarchism. Science does not carry with it an innate political orientation. During the war, German scientists signed Manifesto 93, supporting Germany in the war. Einstein felt that socialism is the natural ally of science. Eddington argued for internationalism as innate to science. The author says there is no correct answer here. If you think science needs many viewpoints, then you should fight for liberal values in science. If you think science suffers from too much government interference, then you should fight for libertarian values in science. How we view science, how we link it to other aspects of our life, changes the way we do science.
The General Theory of Relativity has stood the test of time. The scientific community has verified its predictions repeatedly in the past century, leaving us in awe of Einstein’s genius. Still, well into the late twentieth century, there was some skepticism that the 1919 expeditions had confirmed the theory. The physicist CWF Everitt suggested that Eddington had always intended to prove Einstein right and hence, manipulated the results. Even Stephen Hawking dismissed the 1919 results. He remarked that Eddington’s data is a case of knowing the results he wanted to get, a not uncommon occurrence in science. Yet others felt that politics and authority shaped the 1919 expeditions, and made them exemplars of socially constructed science. These are valid criticisms. We see socially constructed science in play today in the arena of Climate Change and in the debate on COVID-19 and herd immunity. The last chapter in the book, titled “The Legacy of Einstein and Eddington”, has a fascinating discussion on this question, touching on ‘what is science’. Stanley starts with the Austrian philosopher Karl Popper’s precept that an idea is scientific if it is falsifiable. We can prove a scientific idea wrong. Popper contended that the 1919 eclipse was not about demonstrating that Einstein was right. It was a test to see if General Relativity was wrong and it passed the test. Others differed saying that the problem lies in interpreting the results. An Einsteinian could see the curvature of space-time in the 1919 results. A Newtonian could see none. Thomas Kuhn argued that the framework of ideas through which one interpreted the world could change what one thought an experiment’s result was. The author says that we must leave behind the comforting myth about the dispassionate, fully rational nature of science. Humans engage in science, and hence it can be unreliable. What the story of General Relativity tells us is that science is messy and a powerful way to learn about the actual world around us.
I enjoyed reading this book. The prose is crisp, and I found the book fast-paced. The narrative shifts the scene every few pages between Einstein in Germany and Eddington in Britain to show what was happening regarding Relativity at both places. There is a substantial account of the history of the conduct of World War I and its impact on science. I would have liked the book’s title to differ from “Einstein’s War” though. Associating the word ‘war’ with a pacifist like Einstein seems out of place. By the author’s own account, Einstein did not lobby the world for its acceptance of his theory. It wasn’t a war that he carried on for four years. However, looking at the scholarship of the author Stanley, I concluded that he must have had his reasons even though I could not fathom it.
A wonderful book to read to commemorate the centenary of the greatest scientific idea in modern times.