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Physics

Questions tagged [semiclassical]

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Semiclassical descriptions involve a base/background part described classically, and quantum parts representing an effective development in powers of Planck's constant, ħ. They cover systematic approximations such as the WKB, intuitive approaches to the correspondence limit, and a broad class of interstitial physical phenomena.

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I am trying to combine two concepts in this question: quantum entanglement and the deformation quantization.From the definition of entanglement on Wikipedia:Consider two arbitrary quantum systems $A$...
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When solving an equation of motion with spherical symmetry using the WKB approximation, one usually encounters a centrifugal term that diverges as$$\sim \frac{l(l+1)}{r^2}.$$What is the ...
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In the semiclassical (WKB / path-integral) description of quantum tunnelling, the dominant contribution to the transmission amplitude comes from the extremum of the Euclidean action$$S_E = \int \...
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I have a similar question to this forum that was asked 6 years ago... Transmission coefficient of second-order WKB approximationI am working on solving a differential equation using the WKB method up ...
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In the third edition of the book "An Introduction to Quantum Mechanics" by David J. Griffiths and Darrell F. Schroeter the so called Wentzel-Kramers-Brillouin (WKB) method is treated in ...
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I have been trying to solve the Schrodinger equation for a TLS weakly coupled to the EM field along with a 'semi-classical' atom-drive term, with the TLS initially in ground and the field initially in ...
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I believe a similar question is asked here, but there doesn't seem to be a satisfactory answer so I'd like to reformulate it.In the semiclassical model of electron transport, electrons are described ...
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684views

In L&L's quantum mechanics textbook $\S 46$, they derived the WKB approximated wave function at the classically forbidden region:$$\psi = \frac{C_1}{\sqrt{|p|}} \exp\left(-\frac{1}{\hbar} \int |...
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In The Quantum Theory of Fields, Volume II, Weinberg defines the BRST variation $\delta_\theta$ as follows:\begin{align}\delta_\theta \psi & = i t_\alpha \theta \omega_\alpha \psi \tag{15.7.7} \\...
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I was reading Schrödinger's paper, in which he first introduces his wavefunctions and equations. Before explaining the problem I encountered, I will try to set the stage by mentioning what he ...
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How to construct a semi-classical bulk dual for a given CFT state in the context of AdS/CFT correspondence? In particular, I am looking for an explanation/proof of the statement in https://arxiv.org/...
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I am reviewing some basic aspects of the passage from classical field theory to quantum field theory. The steps to obtain a quantum theory are(I). Find a suitable classical action $S$ whose ...
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In this Veritasium video "Infinite Slit Paradox: Something Strange Happens When You Trust QM", the Feynman integral is built up from just one formula (that is completely brushed under the ...
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I seem to be missing a key concept in understanding Bohr's correspondence principle as applied to electron transitions in atoms. In this article, they break the principle into three parts, which they ...
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I use the information from the text titled The Bohr Atom written by Michael Fowler and the Wikipedia page titled Larmor formula while framing my question.In the section titled "The ...

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