All Questions
Tagged with cosmology quantum-mechanics
132
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If there's a small probability particles may teleport anywhere in an infinite Universe, shouldn't stars pop up in existence close to us ever so often?
I've been having a question on the top of my mind for a while, and didn't really manage to get it solved, so I'm asking it here:
Assuming that particles may "teleport" (or superposition, or ...
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Does quantum physics always determine a particle's past state?
I have been studying black holes lately. One complaint I hear often is that information is lost when a particle enters a black hole. Supposedly, this never happens outside a black hole. It is ...
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What are $δ$ and $ε$ in the list of Dirac's five 'fundamental constants', concerning his 'Large number hypothesis'?
From Jean-Philippe Uzan's Varying Constants, Gravitation and Cosmology:
Dirac formed five dimensionless ratios among which1 δ ≡ H0ħ/mpc2 ∼ 2h × 10−42 and equation M1 and asked the question of which of ...
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Could the rotating superfluid halo around a galaxy form a regular Abrikosov vortex lattice and serve as a naturally generated Quantum Matrix?
Spherical halo (shown in blue) surrounding galaxies could be a superfluid [Bose-Einstein condensate] according to Prof. Justin Khoury's hypothesis and may help to understand dark matter and galactic ...
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Time Crystals in the Early Universe?
There is an extremely exciting footnote/remark from Prof. Frank Wilczek during the subsequent Question and Answer (Q&A) session (starting from 01 h 03 min 42 sec) of his recently held presentation:...
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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
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What is the 'effective number of neutrino species'? And how does that, rather than the total number of them, affect the universe?
As stated above...
How can the the physics of early cosmology (articles about which are where I usually come across mentions of such) be affected by an 'effective' number of neutrino types, rather ...
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Are singularities formed only of bosons? [duplicate]
my thinking is that, due to the Pauli exclusion principle, singularities must be formed of bosons (if anything), and not fermions since fermions may not occupy the same quantum state as one another. ...
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Will the ever accelerating space expansion (like at the level of inflation) eventually break causality?
I have read this question:
requires that "for an action at one point to have an influence at another point, something in the space between the points, such as a field, must mediate the action&...
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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 ...
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How to understand the Wheeler-de Witt equation correctly?
I am a student and for me it is still quite difficult to understand the Wheeler-de Witt equation for the wave function of the Universe. This is a kind of analogue of the Schrödinger equation, which ...
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Knowable and Unknowable Hidden Variable theories
Following a recent interesting question about the collapse of the wave function (link at the bottom).
It seems that the wave function is just a mathematical way to give predictions of various outcomes ...
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Am I correct in understanding that in the many-worlds interpretation the Universe is considered as a single quantum object?
Among the tags there is also a topic of interpretation, so I hope that the question will not be closed. In the many-worlds interpretation, the wave function acquires an onotological meaning, that is, ...
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Does the history of the universe change when the initial conditions change in superdeterministic theories?
In quantum mechanics, superdeterminism is a loophole in Bell's theorem, that allows one to evade it by postulating that all systems being measured are causally correlated with the choices of which ...
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Histories of the Universe under Different Initial Conditions
The history of the evolution of the Universe (we are talking about the observable part) on ultra-large scales (larger than the scale of galactic superclusters) under any initial conditions would be ...
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