Jan 27, 2024 12:02 AM
https://iai.tv/articles/the-white-hole-i..._auid=2020
INTRO: In a previous article, Alon Retter argued the big bang was a white hole – a time-reversed black hole, the possible existence of which has been brought to popular attention by Carlo Rovelli. But the big bang and the white hole have crucial differences in their structures, which creates more questions than answers, writes Geraint F. Lewis.
EXCERPTS: Mathematically, black holes are part of Einstein’s general theory of relativity, originally derived in Karl Schwarzschild’s explorations of relativity in 1916. However, black holes remained a theoretical curiosity until the 1960s when astronomical evidence finally convinced us that black holes truly existed.
Time in relativity is complicated and the flow of time, which seems so natural to us, is not defined and needs to be imposed. In Schwarzschild’s original mathematical formulation, the flow of time ensured that gravity was attractive and that mass fell into the hole. However, given the ambiguity of time’s flow, time-reversed solutions are equally mathematically valid. The time-flipped version of a black hole is a white hole and instead of drawing matter in, white holes expel material into the universe.
[...] There are major differences between the mathematical structure of a white hole and the Big Bang. A white hole exists within an infinitely large universe, and matter is thrown into the universe like fragments from an explosion. The Big Bang, however, is not matter pouring into pre-existing space, but the expansion of space itself. Unlike the white hole, which has a central location from where all matter originates, our expanding universe does not possess a unique centre. Every point of space within a Big Bang universe can equally claim to have been at the origin when it all began.
[...] A word of caution, however, as while the mathematics of relativity permits white holes, whether they physically exist remains unanswered. No conclusive evidence points to white holes existing in our universe... (MORE - missing details)
INTRO: In a previous article, Alon Retter argued the big bang was a white hole – a time-reversed black hole, the possible existence of which has been brought to popular attention by Carlo Rovelli. But the big bang and the white hole have crucial differences in their structures, which creates more questions than answers, writes Geraint F. Lewis.
EXCERPTS: Mathematically, black holes are part of Einstein’s general theory of relativity, originally derived in Karl Schwarzschild’s explorations of relativity in 1916. However, black holes remained a theoretical curiosity until the 1960s when astronomical evidence finally convinced us that black holes truly existed.
Time in relativity is complicated and the flow of time, which seems so natural to us, is not defined and needs to be imposed. In Schwarzschild’s original mathematical formulation, the flow of time ensured that gravity was attractive and that mass fell into the hole. However, given the ambiguity of time’s flow, time-reversed solutions are equally mathematically valid. The time-flipped version of a black hole is a white hole and instead of drawing matter in, white holes expel material into the universe.
[...] There are major differences between the mathematical structure of a white hole and the Big Bang. A white hole exists within an infinitely large universe, and matter is thrown into the universe like fragments from an explosion. The Big Bang, however, is not matter pouring into pre-existing space, but the expansion of space itself. Unlike the white hole, which has a central location from where all matter originates, our expanding universe does not possess a unique centre. Every point of space within a Big Bang universe can equally claim to have been at the origin when it all began.
[...] A word of caution, however, as while the mathematics of relativity permits white holes, whether they physically exist remains unanswered. No conclusive evidence points to white holes existing in our universe... (MORE - missing details)