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Physics : Recent Questions and Answers (Page 37)

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

Understanding ground state expectation values of time ordered products of operators

Working through chapters 6 through 8 in Srednicki's "quantum field theory", I am having some trouble conceptually understanding what is happening when we take time ordered products of operators in...

Asked on 10/29/2021

1 answer

Why is the ideal gas law only valid for hydrogen?

I got this question in school:Explain, based on the properties of an ideal gas, why the ideal gas law only gives good results for hydrogen.We know that the ideal gas...

Asked on 10/29/2021

3 answer

Geometric representations of affine Lie algebras

I have recently been reading literature on geometric constructions of representations of affine Lie algebras by Nakajima and others. In particular, the representations arise as cohomologies of moduli...

Asked on 10/29/2021

1 answer

Meissner Effect and Lorentz Force Paradox?

The Meissner effect expels magnetic field lines in a super conductor, see the picture below. Left is normal conducting, right is the superconducting state. ...

Asked on 10/29/2021

1 answer

Why do we care about indistinguishability?

I am reading material related to statistical physics, and I am having a problem understanding why we care about the notions of distinguishably and indistinguishability. I have found What...

Asked on 10/29/2021

2 answer

Why is the Planck length considered fundamental, but not the Planck mass?

The planck length is considered by many to be a lower bound of the scale where new physics should appear to account for quantum gravity.The reasoning behind, as far...

Asked on 10/29/2021

3 answer

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 10/29/2021

3 answer

Is a spontaneous decrease in entropy *impossible* or just extremely unlikely?

I was reading this article from Ethan Siegel and I got some doubts about a sentence about entropy, specifically when Ethan explains the irreversibility of the conditions of...

Asked on 10/29/2021

9 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 10/29/2021

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 10/29/2021 by User688539

3 answer

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