Quantum GravityCarlo Rovelli
Quantum Gravity
by Carlo Rovelli · first published 2014
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…is fundamental to the https://en.wikipedia.org/wiki/Initial_value_formulation_(gen... about which Rovelli has written extensively (e.g. at https://arxiv.org/abs/gr-qc/0202079 and chapter 4 of his book Quantum Gravity, draft on his own page http://www.cpt.univ-mrs.fr/~rovelli/book.pdf ). Unfortunately philosophers have several different versions of "block universe" with varying degrees of determinism. The growing…
on “A Binary Star Is About to Go Supernova and Could Produce a Gamma-Ray Burst” ↗…don’t consider them to be definitive, but see them as open to improvement. It’s the awareness of our ignorance that gives science its reliability." Science is never settled. Rovelli's book is about Loop Quantum Gravity; as unsettled a field of research in science _today_. [0] https://www.goodreads.com/book/show/29767627-reality-is-not-...
on “A new experiment hints at surprising hidden mechanics of quantum superpositions” ↗…by scientists and philosophers throughout history. An intellectually stimulating and not overly technical read about the concept of a universe without time and some of the latest developments in Loop Quantum Gravity (Rovelli’s field of work). I also have a blog post on my Top 10 books from last year: https://medium.data4sci.com/top-10-books-we-read-in-2022-c3d...
on “Ask HN: Books you read in 2022 and recommend for 2023” ↗It is true that there is no experimental evidence, but I think there are some convincing arguments that something must happen at the Planck scale (for very short distances) in a full quantum-gravity theory. Here are some quotes from "Covariant Loop Quantum Gravity", Rovelli and Vidotto (slightly redacted). I suggest the whole chapter 1, in particular 1.2 to get an idea of why fundamentally spacetime…
on “Why is Maxwell's theory so hard to understand? (2007) [pdf]” ↗