All Questions
Tagged with cosmology quantum-mechanics
132
questions
3
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2
answers
112
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Can there be some kind of photon emission caused by cosmological expansion?
Are there any kind of observed and experimentally verified processes or mechanisms where photon emission occurs and which are directly cause by spacetime expansion in some way?
- 2,462
0
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0
answers
96
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From a true vacuum to a false vacuum in expanding space?
It is known that spacetime expansion affects many aspects in the universe. For instance, due to this, a global definition of energy conservation is difficult to define.
Could this expansion affect the ...
- 2,462
0
votes
1
answer
92
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Can we observe two galaxies (other then ours) to be receding from each other faster then the speed of light?
There are a lot of questions and answers on this site that deal with galaxies receding from us faster then the speed of light like this one:
In summary, Hubble Law: v=H(t)D, where v is recession ...
- 29k
0
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2
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155
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If you knew perfectly knew the initial state of everything, could you predict everything? [closed]
Due to the Heisenberg Uncertainty Principle, one cannot know the complete state of a system, or particle. And so, unable to know fully certainly the state of a system, it is impossible to perfectly ...
- 480
7
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116
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How many apparent horizons could the universe have?
I was reading a paper written by Nobel laureate George Smoot, Go with the Flow, Average Holographic Universe, which assumes the holographic principle as true and conjectures that our universe would be ...
- 2,462
1
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0
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75
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Conservation of information in expanding universe
As the observable universe expands the amount of information is increasing, at least locally. How is this compatible with the conservation of information in quantum mechanics?
- 928
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106
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All matter will turn into Fe-56?
from what I understand, fe-56 is the most stable configuration of matter and therefore over time, so Dyson in "Time without end: Physics and biology in an open universe", thanks to quantum ...
- 21
1
vote
1
answer
625
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Why Superfluid Vacuum Theory has not proved yet that Vacuum space is possible a superfluid?
Our Universe and subatomic world being defects of an omnipresent type of superfluid we call "Vacuum Space" therefore a medium, unknown phase of matter is an intriguing idea expressed by SVT.
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- 4,170
0
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2
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90
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Rydberg energy and Hubble constant
Although they are of different dimensions, the value of the Rydberg energy is very close to that of the Hubble constant.
Rydberg energy (R): $2.179 \times 10^{-18}$ [Joule] = 13.6 [eV]
Hubble ...
- 85
2
votes
0
answers
108
views
Could one, in principle, make any predictions using the wavefunction of the universe? [closed]
Do physicists talk about the wavefunction of the universe? What does that wavefunction even mean? Usually, wavefunctions describe probabilities of measurements of a system. But in this case, every ...
- 949
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58
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Is the set of reachable arrangements of an indeterministic universe (of a given material substrate) sensitive to its initial arrangement?
Suppose two equally massive universes have an identical material substrate of the same fundamental particles. Suppose then that these two universes initially have different arrangements of these same ...
0
votes
1
answer
98
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Is the set of reachable states of an indeterministic universe sensitive to its initial conditions?
Suppose two universes with the same amount of mass-energy and evolving according to the same natural laws, but having different initial conditions. Is the set of states that are reachable by the ...
4
votes
0
answers
109
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What is the best way to describe a classical field in quantum field theory (coherent state)?
In quantum field theory, we have the following expansion on a scalar field (I follow the convention of Schwarz's book)
$$\phi(\vec{x},t)=\int d^3 p \frac{a_p exp(-ip_\mu x^\mu)+a_p^{\dagger}exp(ip_\mu ...
- 442
-3
votes
3
answers
183
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Are most reals fake? Does it make a difference?
There are uncountably many reals. However, there are only countably many definable numbers. Thus, almost all reals are undefinable. Undefinable means that the shortest representation of that number ...
- 129
3
votes
1
answer
99
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Which of these 2 ideas is correct about a "bubble" of false vacuum decay?
The whole volume of the bubble is true vacuum.
Only the surface layer of the bubble is true vacuum while the interior has turned back to false vacuum.
