All Questions
15
questions
0
votes
3
answers
73
views
Are there universes where "symmetry breaking" went differently? [closed]
What have happened with other possible variants of asymmetry?
Are there other universes being run in parallel to our universe where the ball is not at C, but at B?
Stephen Wolfram told
I have found ...
- 129
0
votes
0
answers
38
views
How can baryonic CP violation contribute to the explanation of the large matter-antimatter asymmetry in our universe?
I have been doing baryonic CPV experimental search in the past few years. However, I never really get a good clue on this fundamental question.
The thing is that CPV has only been found in the meson ...
- 1
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
0
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0
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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
views
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 ...
3
votes
1
answer
99
views
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.
1
vote
1
answer
142
views
If the universe is infinite, would QM allow the existence of "weird" zones? [closed]
If we suppose that the universe is spatially infinite and extends more or less homogenously in all directions without end (having similar galaxies, stars etc.), then we can assume that there is a more ...
- 416
0
votes
0
answers
29
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Quantum tunneling wave function derivation
In Vilenkin's paper Quantum cosmology and the initial state of the Universe, We find the tunneling wave function to be $ \psi _{T}=\frac{Ai(-z)+iBi(-z)}{Ai(-z_{0})+iBi(-z_{0})}$ (4.27 in the original ...
- 11
0
votes
0
answers
60
views
What does Dr. Krauss mean by a universe from "nothing." [duplicate]
I have read for a couple weeks now about a universe from nothing. I understand that the gluon field supports quarks in a proton. I understand that the universe has zero total energy. I'm confused ...
- 11
0
votes
0
answers
114
views
Did Stephen Hawking propose that the universe arised from truly nothingness?
Stephen Hawking giving a lecture describing how the universe would have arisen from his model (developed with James Hartle) or "no boundary" conditions, once said:
Unlike the black hole pair ...
- 2,462
1
vote
1
answer
471
views
What is meant by "spontaneous creation" in this paper?
I have some questions in regard to the paper "Spontaneous creation of the universe from nothing". If I am not mistaken it is akin to Alexander Vilenkin's proposed cosmological model that has the ...
- 11
1
vote
1
answer
140
views
Does quantum mechanics predict Universe is infinite? because otherwise every wavefunction would be normalisable
I studied the hydrogen atom recently and found that reason for discrete energy level is simply because of the fact that eigenfunction corresponding to the energy between ground state and first excited ...
- 71
0
votes
2
answers
144
views
How would Boltzmann Brain function with all anti-matter in it? [closed]
Please cope with me, I have been thinking about Boltzmann Brain yesterday and if Quantum fluctuations always happen in pairs of particle and antiparticle since sum of all energy has to be 0.
My brain ...
- 1,125
0
votes
4
answers
3k
views
Boltzmann brain vs Actual universe probability actual calculations [closed]
I have been reading lots of physics lately about how universe came into being. One idea is that universe is long gone (thermal death) and it might not exist the way I feel it and I am a sequence of ...
- 1,125
0
votes
1
answer
115
views
Fractional number of particles in the universe?
Is it possible, that the metagalaxy contains a fractional (non whole) number of particles or fractional number of a particular kind of particles (such as electrons)?
Sorry, if my question is stupid, ...
- 375