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Physics : Recent Questions and Answers (Page 774)

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

Question about the circumstances of apparent causality violation due to objects with negative ADM mass

In The Generalized Second Law implies a Quantum Singularity Theorem, Aron C. Wall asserts that an object with a negative ADM mass would produce...

Asked on 12/02/2020 by CuriousDroid

0 answer

Translation operator and parity operator

(This is taken from Introduction to Quantum Mechanics by D. Griffiths, 3rd edition, Problem 6.18 .) If a system has inverse symmetry, we know that [$hat{H},hat{Pi}]...

Asked on 12/02/2020 by AA10

2 answer

Orbital period and nodal precession & apsidal precession

In classical orbital mechanics as per Newton/Kepler, the time taken to complete one orbit around a body of mass $M_e$ is: $$T = 2 pi cdot sqrt { frac...

Asked on 12/02/2020 by Avijit

2 answer

Hermiticity and vanishing wavefunction

"Compare this to the eigen functions $e^{-pi x} $ of linear momentum, where we could argue that $p$ had to be real to keep wavefunction bounded as ...

Asked on 12/02/2020 by physicshub

2 answer

Do 2d CFTs define healthy 4d QFTs?

When doing 2d CFTs we typically complexify coordinates and formally consider $mathbb C^2$, with the understanding that, in the end, we are to restrict to the real slice ...

Asked on 12/02/2020 by AccidentalFourierTransform

1 answer

Is it possible for $Delta x$ ($sigma_x$) of any free particle wave packet to be decreasing at any time?

Consider any wave packet describing a free particle (so no potential or other forces acting on it). Then it can be shown that $Delta p$ does not change in time....

Asked on 12/02/2020 by Ryker

4 answer

If we had enough energy available in particle colliders, what reactions could show up if the quark and electron fields weren't fundamental?

Suppose the quark and lepton fields weren't the fundamental fields of Nature, but that a "deeper" Lagrangian connected to a generic model of sub-quarks and-leptons would take over the...

Asked on 12/02/2020

1 answer

Clarification on $M^2$ factor

In beam optics, the $M^2$ factor is a "catch-all" single number that describes how "good" a beam is, i.e., how close it is to an ideal Gaussian beam, which...

Asked on 12/02/2020 by John W.

0 answer

What do photons look like?

We have many theories that advocate the particle nature of light. But have we ever observed photons physically? If so: what do they look like? How big are they? If...

Asked on 12/02/2020

6 answer

Calculating pressure and flux tensors in radiative astrophysics

I need to calculate the components of the radiative flux tensor and the pressure tensor, but I am having a little trouble figuring out what the integral should be. The...

Asked on 12/02/2020 by philosophytophysics

1 answer

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