4
votes
Accepted
Are the mass, diameter and age of the Universe frame dependent?
Spacetime geometry is, some details aside, very similar to ordinary geometry. Length and time are as relative in spacetime geometry as length is relative in ordinary geometry. And length isn't ...
- 25.3k
3
votes
Accepted
Is Dark Energy Taking Over?
Is dark energy taking over?
Short answer: yes.
Longer answer: yes, probably. We aren't certain about how the density of dark energy will evolve as the universe expands, but in the simplest models the ...
- 47.4k
2
votes
Why can't we see past the observable universe?
The Hubble law is $v=Hd$. When you multiply H by the distance, you get a velocity (units distance/time). That is what the Hubble law is saying. Once you reach a distance (the cosmic horizon) in which ...
- 119
2
votes
Why can't we see past the observable universe?
The observable universe gets bigger with each new advance in telescope technology. In this sense the "observable universe" is that part of it which is sending just enough photons our way to ...
- 90k
1
vote
Since the instant of the big bang, has the progression of the universe been entirely determined?
No, and indeed if inflation did happen the unpredictability started only $10^{-33}$ seconds after the Big Bang.
If the universe underwent an inflationary stage then during this stage a cosmological ...
- 351k
1
vote
Since the instant of the big bang, has the progression of the universe been entirely determined?
Newtonian mechanics is theoritically predictable from initial conditions. However there are some gocthas.
You need to know the initial conditions infinitely precisely to predict the future accurately. ...
- 36.3k
1
vote
Is Dark Energy Taking Over?
Depends on the scale. The way we interpret the observations is that we have bound clusters of galaxies that aren't expanding. Matter dominates the energy density in these clusters. On smaller scales, ...
- 18.9k
1
vote
Is the time evolution of the universe cyclic?
There are many misconceptions in this question but let's address the question as written:
The question claims that for a self-adjoint operator $H$ the one-parameter group $\mathrm{e}^{\mathrm{i}Ht}$ ...
- 122k
1
vote
Accepted
Is the time evolution of the universe cyclic?
What you are referring to is called a "quantum revival" via a recurrence theorem (although your math/logic I can't completely follow). Any isolated system experiences such a revivial.
But ...
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