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Physics : Recent Questions and Answers (Page 526)

Find answers to your questions about Physics or help others by answering their Physics questions.

How does physics deal with perpetual motion in spins?

This is a bit a bit of a weird question. Simply put, if a body such as a planet spins, there is no internal issue (that I know of) that...

Asked on 02/28/2021

0 answer

Grand canonical partition function of hypothetical particles

I have to calculate the grand canonical partition function of a system of hypothetical particles, wherein each single-particle quantum state can be occupied by up to 3 particles. Obviously, this...

Asked on 02/28/2021 by Sylorinnis

1 answer

When is the phase shift small and linear in $k$ for low energy $s$-wave scattering?

I was wondering when should we expect the phase shift to be small and linear in $k$ for low energy $s$-wave scattering, so that the scattering length can...

Asked on 02/28/2021

0 answer

Differences between types of black holes

What are the differences between stellar black holes, intermediate black holes, supermassive black holes and miniature black holes?...

Asked on 02/28/2021 by snowballCode

1 answer

Transition between vibronic states and the meaning of transition dipole moment

Let's say we have a molecule which belongs to $D_{3h}$ point group. The IRREPs of inital and final states are as follows $A'_{1}$, $E'$. Hence, the IRREP...

Asked on 02/28/2021

0 answer

Explicit independence of Hamiltonian phase-space variables from the time parameter

In general, we have for a Hamiltonian flow $H$ of some "time" parameter $t$, the following relation for any function $f=f(q,p;t)$ of the phase-space generalized position (...

Asked on 02/28/2021

1 answer

Does the Pauli exclusion principle apply to one fermion and one antifermion?

I understand that two fermions cannot simultaneously have the same <momentum, spin> state. I know this is also true of two anti-fermions. But is it possible for one fermion and...

Asked on 02/28/2021 by Nick Ormrod

3 answer

Why is there an additional $NI$ term in this ${rm SU}(N)$ generator, from Matrix Quantum Mechanics?

This question refers to equation (11) in the latest preprint of the following paper:X. Han, S. A. Hartnoll and J. Kruthoff, "Bootstrapping Matrix Quantum Mechanics", Phys. Rev. Lett. 125, 041601...

Asked on 02/28/2021 by Adam Trask

1 answer

QM Basis Transformation Through Unitary Operator

I've a short question about basis transformations in QM. Suppose I have two bases ${|{phi_n}rangle}$ and ${|{phi_n'}rangle}$. For brevity, we can make them orthonormal. I know that any...

Asked on 02/28/2021

1 answer

QM - Particle in Potential Well - Probability of states

A particle is confined in a potential well such that its allowed energies are $E^n = n^2epsilon$, where $n = 1, 2, dots$ is aninteger and ...

Asked on 02/28/2021

1 answer

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