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All that the "Big Bang" refer to is 1) the fact that the (visible) universe was once much hotter and denser than it is now and 2) if we extrapolate back in time
by aroberge 9y ago
All that the "Big Bang" refer to is 1) the fact that the (visible) universe was once much hotter and denser than it is now and 2) if we extrapolate back in time, using the theories that we have, there was a point where the density was infinite.
Of course, we know that our theoretical model break down before that (since we don't have an experimetally verified theory of gravity compatible with quantum mechanics). Physicist that work in the field (and I used to be one of them) are well aware that we cannot extrapolate past the regions of validity of our theories and no one claim that there was indeed a singular point ("Big Bang") as mentioned in descriptions aimed at a non-expert audience.
- EGreg 9y agoI am pretty sure it's not true that "no one" claims there was not a singularity at the beginning. http://www.hawking.org.uk/the-beginning-of-time.html http://www.hawking.org.uk/the-beginning-of-time.html I even saw that recently Stephen Hawking started theorizing that the "Big Bang" was like a black hole. And other physicists weigh in: http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/universe.html http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/... Look at this wikipedia article. Someone must be writing it? https://en.m.wikipedia.org/wiki/Initial_singularity https://en.m.wikipedia.org/wiki/Initial_singularity In fact there are some contradictions between Quantum Mechanics and an actual big bang: https://m.phys.org/news/2015-02-big-quantum-equation-universe.html https://m.phys.org/news/2015-02-big-quantum-equation-univers...