Physics Help Forum what was energy of universe at big bang?

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 May 20th 2017, 09:40 PM #1 Junior Member   Join Date: Aug 2016 Location: Napa, CA Posts: 6 what was energy of universe at big bang? I got couple questions regarding the following YouTube video: 1. When Universe was at size of one billionth of a proton, what was the energy of the universe at that point? 2. It says during the inflation expansion of universe, the space mass density of universe stayed constant. If this was the case, as the universe got bigger, then where this extra energy was coming from? Thanks for your inputs.
 May 21st 2017, 09:40 AM #2 Member   Join Date: Apr 2017 Posts: 46 Does the inflation expanse contradict the law of conservation of energy in its current form? I suspect it is. If so, this fundamental physics law seems to be not universal? The only one N-dimensional flat space is the Euclidean space. The 3-dimensional space of classical physics is Euclidean, but the 4-dimensional space of SR or GR isn't Euclidean, therefore it can't be "flat". Do we need to rewrite the whole relativity theory? I also don't understand the balloon analogy. Indeed, the surface of an expending balloon becomes "flatter and flatter", but it never going to be "absolutely flat". But our universe according to this video is "exactly flat". Could somebody explain the mechanism how constant mass density keeps the universe flat?
 May 21st 2017, 02:07 PM #3 Senior Member   Join Date: Nov 2013 Location: New Zealand Posts: 550 It seems like the early accelerated expansion of the universe is somewhat in dispute. https://en.wikipedia.org/wiki/Accele...ting_expansion
May 21st 2017, 08:51 PM   #4
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the increase in energy of the universe

 Originally Posted by kiwiheretic It seems like the early accelerated expansion of the universe is somewhat in dispute. https://en.wikipedia.org/wiki/Accele...ting_expansion
Hi kiwiheretic,
That link was interesting, and apparently it discusses much more complex issues of the expansion. My question is much simpler than that, if during the inflation the size of universe grew 10 ^28 times, and the energy density remained constant, then during the inflation the energy of the universe grew 10^28 times, where did this energy come from?

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