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Results tagged with quantum-mechanics
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user 26397
Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.
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Can dark matter be ordinary matter in a quantum coherent state?
The hypothetical dark matter halo envelopping a galaxy looks like to a gaussian distribution of position probability density of a particle in a quantum coherent state.
How long should a wave function …
0
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Can dark matter be ordinary matter in a quantum coherent state?
If we ignore GR, the answer is no, by using the decoherence time formula (19) of Zurek's paper p13, depending on the thermal de Broglie wavelength.
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1
answer
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Can the foundation of physics be completed? [closed]
The current foundation of physics is not complete because two parts of it, namely General Relativity (GR) and Quantum Mechanics (QM), are not compatible. But why should we believe that it can be compl …
2
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2
answers
1k
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What the lifetime of a massless black hole of photons?
Let a bundle of photons very concentrated in a very small area so that the space-time is curved as a black hole, and the photons can't escape: this is what I call a massless black hole of photons.
Qu …
3
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1
answer
202
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A quantum gravity replacing the time variable by an operator
In this video (from 57:38 to 58:31) Aurélien Barrau talked about a simple obstruction for the existence of quantum gravity, stated in an unusual way (to me):
Original in French:
Ce qui m'intéress …
4
votes
Quantum entanglement versus inflation in the early universe
I've found this paper: Cosmological quantum entanglement, of E. Martin-Martinez and N. C. Menicucci.
(last revised 19 Oct. 2012)
Abstract We review recent literature on the connection between qua …
9
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1
answer
341
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What is the quantum structure of the interstellar matter?
Consider an interstellar medium of one hydrogen atom/cm$^3$ with $500$ photons/cm$^3$ coming from CMB. This density of particles is very weak according to quantum decoherence. So, according to Schrödi …
0
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2
answers
187
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Thought experiment on light accumulation
Consider an object which is a spherical one-way mirror, and let's call it the "Sphere".
For the needs of the thought experiment, suppose that:
the Sphere is perfectly spherical
the mirror is …
1
vote
0
answers
133
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Can we measure without collapsing (too much) the wave function, according to decoherence the...
According to decoherence theory, the collapse of the wave function is a continuous process due to interaction with environment.
In a measure, there are interactions with photons (for example).
Can we …
4
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0
answers
399
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Any real contribution of functional analysis to quantum theory as a branch of physics? [closed]
In the last paragraph of this last paper of Klaas Landsman, you can read:
Finally, let me note that this was a winner's (or "whig") history, full of hero-worship: following in the footsteps of H …
8
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2
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292
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The time-energy uncertainty relation on a compact space
This post follows this answer of Ben Crowell.
The problem with the time-energy uncertainty relation $$[H,T]=i\hbar$$ is that it implies that the spectrum of the energy operator $H$ cannot be bounde …
2
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1
answer
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Spectral series' formula of a given atom (other than hydrogen-like)?
The hydrogen spectral series is given by the Rydberg formula:
The energy differences between levels in the Bohr model, and hence the
wavelengths of emitted/absorbed photons, is given by the Ryd …