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Physics : Recent Questions and Answers (Page 216)

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

How do Astronomers Measure the Mass of a Planet using Doppler Spectroscopy?

So, I am making an essay explaining planet-hunting techniques. And while I do get how astronomers measure the semi-major axis of a planetary orbit (using Kepler Laws), I don't get...

Asked on 07/02/2021 by Heath

2 answer

Is there a "geometrical" reason for the principle of stationary action?

The principle of stationary action states that the trajectory $q(t)$ a physical system traces in configuration space is the one for which the action $$S[q]:=int_{t_0}^{t_1}L(t,q,dot q)mathrm dt$$ is...

Asked on 07/02/2021

1 answer

What is density matrix of a Kerr black hole in the vacuum?

What is the density matrix of a Kerr black hole in vacuum? Or how can we evaluate the density matrix of a Kerr black hole from its entropy, which is...

Asked on 07/02/2021 by Siddharth Sharma

0 answer

Path Integral measure over differential forms

Can one define a path integral over differential forms, for instance $$int [mathcal{D}phi]$$ where $phi = X_{mu}dx^{mu}$ a one-form and $[mathcal{D}phi]$ is the path-integral measure? Does such...

Asked on 07/02/2021

0 answer

Is this intuitive understanding of "averaging over all realizations of a noise" correct?

Consider a continuous random variable $eta(t)$ such that $$langle eta(t)rangle=0, forall t$$ where the average $langle ...rangle$ is taken over all possible realizations of the noise at...

Asked on 07/02/2021

1 answer

Predicting the probability distribution in a potential

I've been dealing with a kind of problem in quantum mechanics, where they give us an arbitrary potential, and then ask us to predict the form of the probability amplitude...

Asked on 07/02/2021

2 answer

Uncertainty in mode number operator and Hawking's original paper

I began reading Hawking's paper Particle Creation by Black Holes (1975, Commun. math. Phys 43, 199—220) but am a little confused by what he writes at the bottom of...

Asked on 07/02/2021 by SvenForkbeard

0 answer

Faraday's law conditions

Does Faraday's law only apply when there is a changing B field or change in area for a closed loop? Thanks...

Asked on 07/02/2021 by aP123

1 answer

How is electric current possible if no electric field exists inside a conductor?

How is electric current possible if no electric field exists inside a conductor?Since no electric field exists inside a conductor. How is electric current possible as $$v_d=frac{(eE)t}{2m},;;{E=0}$$ and ...

Asked on 07/02/2021

1 answer

Attractive interaction in BCS theory

The common way to discuss BCS superconductivity, as I have seen in several books, is to assume that we have a Fermi liquid, on top of which we add an...

Asked on 07/02/2021 by Yarden Sheffer

1 answer

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