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Physics : Recent Questions and Answers (Page 98)

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

My understanding of General Relativity

My Background: In high school, I completed AP Physics C Mechanics and Electricity and Magnetism. In my first year of undergrad, I completed a course on Newtonian Mechanics and a...

Asked on 08/23/2021

3 answer

Why Einstein action is not Yang-Mills action for gauge theory of Poincaré algebra?

It is well known, how to construct Einstein gravity as gauge theory of Poincare algebra. See for example General relativity as a gauge theory of the Poincaré algebra. There...

Asked on 08/23/2021

1 answer

The roundabout definition of electric charge

In the book called Electricity and magnetism by Purcell, in page-240, he writes that Q in a surface is defined as $$ Q = epsilon_{o} int_{partial S(t)} vec{E} cdot...

Asked on 08/23/2021

3 answer

Reference request for vertex correction of electron-phonon interaction beyond Migdal's theorem

I am considering the calculation of the vertex correction due to electron-phonon interactions. Specifically, I am looking for solutions to the integral (Eqn. 1) $$int dq G(q)D(q-p)G(p+k)$$ where ...

Asked on 08/23/2021

0 answer

Why are the number of magnetic field lines finite in a particular area?

One can draw/imagine as many unique (curved/straight) lines as he/she wants in some specified finite area (assuming that each line is unique if it doesn't overlap with another line). Then...

Asked on 08/23/2021 by Tim Crosby

5 answer

General Relativity: is there a better way to get spherical coordinates?

We know that (see this wikipedia page) in the metric of Minkowski spacetime:$$ds^2=(dt)^2-(dx)^2-(dy)^2-(dz)^2 tag{1}$$and we also know that in spherical coordinates this same metric becomes:...

Asked on 08/23/2021

6 answer

Is this a kinematics paradox?

You consider a shaft which can rotate freely (there will be of course a frame with ball bearing to hold the shaft firm and to allow it to rotate with...

Asked on 08/23/2021

4 answer

What makes a constant of nature fundamental?

I came across a video on youtube in which Alexander Unzicker argues that in order to have a scientific revolution, one of the constants of nature should...

Asked on 08/23/2021 by Ekrem

1 answer

Why no gravity lens around planets?

If large mass causes a curvature around spacetime, then why don't we see a gravity lens around our planets?...

Asked on 08/23/2021 by user6579

4 answer

What does it mean for an operator to have both a continuous and discrete spectrum?

The title may be a little confusing, so let me clarify the question. In the simple 1D problem of a quantum particle in (finite) well, the allowed energy eigenvalues for...

Asked on 08/23/2021

3 answer

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