All Questions
Tagged with cosmology quantum-mechanics
132
questions
-2
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Can Poincaré recurrences happen eventually in a universe with zero vacuum energy?
I am interested in the topic of possible vacuum up-tunneling and down-tunneling events in cosmology. One popular instance of this is a vacuum decay from a metastable vacuum energy level to a "...
- 2,462
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68
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Are vacuum "up-tunneling" phase transition in AdS and Minkowski spaces impossible?
I am interested in the topic of vacuum phase transitions in models of the universe. One popular instance of this is a vacuum decay from a metastable vacuum energy level to a "true" one (in ...
- 2,462
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3
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73
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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
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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
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2
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85
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If a laser is bounced off two mirrors repeatedly for several years, will it g et red-shifted?
I understand that red shift is what shows how far away the star light came from, or how far back in time the light was emitted? If so, should we not see red-shift if a laser is bounced repeatedly off ...
- 43
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1
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47
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Electrons keeping dynamical quantum fluctuations?
I was thinking about this paper (https://arxiv.org/abs/1405.0298) where the authors argue that there wouldn't be dynamical quantum fluctuations in a De Sitter space as fluctuations would be static ...
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3
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126
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Does science have evidence that the simulation hypothesis is true? [closed]
It is often written that the simulation hypothesis cannot be proven or disproved.
There is also a lot of talk about the fact that the simulation hypothesis is not science.
But the people also write ...
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1
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103
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How fast would a hypothetical microscopic quantum black hole evaporate with an effective mass of two protons?
According to the analysis shown in this research here, see link the evaporation time can be calculated in seconds using this equation:
$$
\begin{array}{l}
t_{\text {evap }}=\left(\frac{5120 \pi G^2}{\...
- 4,170
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40
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How would have electron and muon fields been identified as distinct in the electroweak era?
During the Electroweak era, the Higgs mechanism had not yet distinguished particles such as electrons and muons by mass. Is there a conceivable experiment, or a hypothetical cosmological observation ...
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3
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1
answer
132
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How was the universe once small enough to be subject to quantum mechanical effects?
I have often read that our universe was once small enough to be subjected to quantum mechanical effects, potentially altering how our universe turned out. This is a large theme in Laura Mersini-...
- 31
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2
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122
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Quantum fluctuations and symmetries?
While reading this piece about symmetry breaking, in section 3 I came across the term "anomalous symmetry breaking", which happens when a symmetry is broken by quantum fluctuations:
Let us ...
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2
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102
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What is the role of an observer in "consciousness causes collapse"? [duplicate]
If a "conscious observer" is part of a theory of physics (e.g. some versions of QM, cosmology), then how (according to what theories) did the universe evolve before the existence of ...
- 203
2
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112
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Toy example of superdeterminism using Rule 30
From what I understand of Bell's Theorem, it requires giving up local realism or embracing superdeterminism. I still haven't been able to understand why superdeterminism gets such a bad rap, so I've ...
- 204
3
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1
answer
132
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Cosmological perturbations and energy in an expanding universe?
I was reading an interesting book from cosmomogist Viatcheslav Mukhanov Physical Foundations of Cosmology and I had a specific question about it:
It is usually said that energy conservation is ...
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2
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229
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If entropy increases with time, are humans' thoughts becoming more random as time increases? [closed]
If entropy increases with time, are humans' thoughts becoming more random as time increases? What effect would entropy have on the brain over generations from the absolute space-time coordinate? Are ...
- 1