why do we think that the universe is made of electron and quark? in a precise sense, "electron" and "quark" are just names for human convenience, to indicate that they are two different stuff. their properties like charge, mass, spin etc are also just indicative of certain interaction they engage with. the real things those matters, let say for an electron, are (-1, 1/2, 9.10938356 × 10^-31, etc) which represent charge, spin, and mass respectively. same goes for quark as well. so the question would be, why do we think that the universe is not made out of just numbers like (-1, 1/2, 9.10938356 × 10^-31, etc) instead of some abstract entities like electron and quark?
or, if Einstein’s description of space-time and gravitation is correct, and the notion of spacetime curvature requires Riemannian manifolds and tensors, then why we think that the manifolds and tensors are abstract but the spacetime is real? why not the opposite?
put it in another way, if you think (2 + 2 = 4) is so true that even (2 unicorns + 2 unicorns = 4 unicorns) doesn’t make an invalid operation, will this (2 + 2 = 4) still hold true in the context of absolute nothingness? if yes, from where this rule came from? isn't it makes more sense that the numbers and the mathematics make up the true reality? and the spactime is just a unicorn?
modern platonic thinking like this stemmed from a famous thought experiment by Plato known as “Allegory of the Cave”. in which Plato stated that we might never know the true reality of the world. for us, reality will be like the shadow in the cave’s wall.
platonic existentialism of our time states that the numbers, manifolds, tensor, etc, in other words, the mathematical are the Platonic reflection of reality, which gives rise to physical reality like the universe itself, then the universe created the brain consequently the consciousness came to be, and with consciousness, we perceive the idea of mathematics, manifolds etc and the circle repeats itself. thus platonic thinker claims that consciousness must be a fundamental property of everything that exists and makes up the reality.
wait a minute, one might argue, but not all mathematical realities are true! they would say that all mathematical realities those are not true in our universe must be true for other universes. such ensemble of many universes is called "the mathematical multiverse", it is not the same thing as the cosmological multiverse. (to get a hint, please see, "Our Mathematical Universe: My Quest for the Ultimate Nature of Realit" by Max Tegmark))
this book is a metaphysical one, a concoction of 80% ontology and 20% cosmology.
human perception has two philosophical singularities, “infinity” and “nothing”. among this two infinity is the easiest to handle compare to nothingness. if you try to imagine the infinity, it would be all-inclusive, i.e. you will include yourself inside the infinity. the only trouble you will face is that your trillions of synaptic connections would be overwhelmed by the vastness of infinity, you would simply fail the grasp to the boundary of an infinity. but, thinking of the nothingness is far more difficult, how can you imagine something which does not include your own conscious observation? so, the question is, does nothingness really exist? or ever existed?
how can something come from nothing? cosmologically energy of Higgs field tunneled into quantum fluctuation inside a false vacuum caused the big bang. well, from where this Higgs field and quantum rule came from? this can be answered only if we drop the idea of nothing and introduction of the cosmological multiverse.
ontologically a divine entry wouldn’t help either. basically, "what caused the big bang?" and "who created the supreme entity?" are the same questions, both are an infinite regression, though the formal is considered a checkmate while the later a blasphemy.
like the book ‘A Universe From Nothing,’ by Lawrence Krauss, which is a 90% cosmology and 10% ontology, Mr. Holt didn't have a definitive answer. but still it is a five star book. there are few points I should take a note of:
one, there was a fuzz about the scientific entitlement of Steven Hawking. what new innovation he has contributed to science? we all know what he did, but in short, the answer would be, he is the father of quantum cosmology.
second, despite our sheer knowledge we simply cannot outsmart one ancient gentleman (probably two), Plato (and most probably his student, Aristotle). it is often quoted that "all philosophy is a footnote to Plato". no matter how hard you try, you can't be smarter than Plato. this is a personal opinion.
third, to be a philosopher you need to know the formal logic rigorously. it is an academic discipline. luckily I was halfway through a great course called "An Introduction to Formal Logic" by Steven Gimbel, otherwise, this book would be a flood of neutrino passing through my brain with negligible interaction, as if it never existed at all.