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Physics : Recent Questions and Answers (Page 125)

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

Do the probability density and the probability current density have a unit

I could not find what is the probability density and the probability current density of one-dimensional Schrödinger equation units?...

Asked on 08/09/2021 by ece

3 answer

Electric Potential, Work Done by Electric Field & External Force

I did lot of searching but couldn't find any textbook nor any webpage which could clarify my doubt. Maybe my doubt is insanely stupid and I was dumb for not...

Asked on 08/09/2021 by Yashas

3 answer

Do interferometers require equal-powered (or as equal as possible) beams being emitted at the target and the photodetector(s)?

I am designing an interferometer for an experiment. The setup consists of (1) the laser source, (2) the interferometer itself (consisting of optical components and photodetector(s), and (3) the target...

Asked on 08/08/2021

1 answer

Dimensionless vs. dimensional RG-Flow equations

When one writes down RG-Flow equations for any theory, at some point one encounters statements like"It is useful to properly rescale the above exact flow equations and rewrite them in...

Asked on 08/08/2021

0 answer

Expectation value of $e^{frac{i f(t)}{2} sigma^z_1 sigma^z_2 }$

What should be an intuitive way to start thinking when I need to compute the expectation value of $e^{frac{i f(t)}{2} sigma^z_1 sigma^z_2 }$? Do I need to expand...

Asked on 08/08/2021

1 answer

What is the difference between kinetic momentum $p=mv$ and canonical momentum?

What is the difference, if any, between kinetic momentum $p=mv$ and canonical momentum? Why is canonical momentum important (specifically to classical field theory)?...

Asked on 08/08/2021

3 answer

How to make a $2times 2$ Hamiltonian using any $2$ levels of an $N$-level Hamiltonian?

Is there a standard way for me to isolate 2 of N bands of a general $Ntimes N$ Hamiltonian? That is, I want to make a $2times 2$...

Asked on 08/08/2021

1 answer

Tidal effect on interferometry

Interferometry relies on the change in the phase of two orthogonal light beams reflected back to the source point. Assume there is an interferometer at the equator, one mirror is...

Asked on 08/08/2021

1 answer

Lehmann representation of Green function

The Lehmann representation of the Green function to a system with $N$ identical particles can be write as $$G(textbf{x}, textbf{x}', E) = sum_{n} frac{langle Psi_{0}^{N} | psi(textbf{x})| Psi_{n}^{N+1}...

Asked on 08/08/2021

1 answer

Dualities in Physics and Fourier Transforms

In many articles, authors compare physical dualities to Fourier transforms. For example:Joseph Polchinski, in his article "String Duality" (hep-th/9607050v2), writes: "Weak/strong duality [...] is similar to a Fourier transform, where...

Asked on 08/08/2021

0 answer

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