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Physics : Recent Questions and Answers (Page 627)

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

Conducting cylinder by dielectric interface

To help me with a project I'm working on, I attempted to solve what I thought was an easy problem. There is an infinite, conducting cylinder of radius $R$...

Asked on 01/23/2021 by renov93

2 answer

How can I visualize a gas giant?

From wikipediaGas giants are commonly said to lack solid surfaces, but it is closer to the truth to say that they lack surfaces altogether since the...

Asked on 01/23/2021 by physics1

2 answer

Cartan subalgebra and Casimir invariants

To my understanding, if group $G$ is semisimple, $mathfrak{g}$ is its Lie algebra, and $Delta_T=[T,cdot]$ is the adjoint representation, one can analyze its spectrum with $[T,U]=lambda...

Asked on 01/23/2021

0 answer

How far the galaxy's 'flat part of rotation curve' extends?

I know that the galaxy rotation curve doesn't obey general relativity and instead of decreasing, the star velocity remains constant which is shown by a flat rotation curve (rotation velocity...

Asked on 01/23/2021 by user210956

2 answer

When pressure is exerted on parallel hydraulic pistons, do they start extending at the same time?

If there are two hydraulic cylinders connected in parallel, each with a different load (shown in the picture below), will they start extending at the same time? I'm having a...

Asked on 01/23/2021 by Blue7

5 answer

Are there alternative but equivalent formalisms for Quantum Field Theory?

I am curious if there are any alternative formulations of QFT generally, in the same way that QM can be reformulated into different, but equivalent formulations beyond Schrodinger wave mechanics...

Asked on 01/23/2021 by user6873235

1 answer

Path integral formulation for Green's functions

In the first place, I am struggling when trying to derive the path integral formulation of the Green function for non-interacting particles $$G_{ij}(tau)=-frac{1}{Z}int D(bar{psi},psi) psi_i(tau)bar{psi}_j(0)e^{-iS(bar{psi},psi)}$$ with the action ...

Asked on 01/23/2021

0 answer

Quantum master equation and off-diagonal terms

I have a couple of related questionsWhat is exactly the difference between the quantum master equation and the regular master equation? My understanding is that the normal master equation is...

Asked on 01/23/2021

1 answer

Question about a paper of Longuet-Higgins on the steepest progressive wave in deep water

I have great difficulties to understand the article "On the Form of the Highest Progressive and Standing Waves in Deep Water", which is available freely on Jstor....

Asked on 01/23/2021

0 answer

Swampland conjectures and $f(R)$ gravity

Why the swampland conjectures should be satisfied even in backgrounds with the $f(R)$ gravitational model, if the gradient energy (or the kinetic term of the scalar...

Asked on 01/23/2021 by lightly

1 answer

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