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Physics : Recent Questions and Answers (Page 292)

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

Sample functions of stochastic processes violate Dirichlet conditions. Why?

Suppose we have a real-valued periodic function that satisfies the Dirichlet conditions. In this case its Fourier series converges. With some expedients this concept can be extended also to non-periodic...

Asked on 06/02/2021 by harprah

0 answer

Is it possible to transfer light between two elements at a distance closer than the wavelength of the light?

Let's say we have a nanoscale laser or led(5nm width/length/height) emitting photons(red, 650nm wavelength) in a direction parallel to its plane, then at 20nm distance in the direction of the...

Asked on 06/02/2021 by 6D65

4 answer

How to obtain hydrodynamics from many-body quantum mechanics?

It is known that the Schrodinger equation is equivalent to the Euler equation (with a "quantum potential" term) and to the probability conservation equation (which is formally...

Asked on 06/02/2021

0 answer

How is the Theta angle of $SU(5)$ grand unified theory related to the three Theta angles in the $U(1) times SU(2) times SU(3)$ standard model?

There are three Theta angles in the $U(1) times SU(2) times SU(3)$ standard model: call them$$U(1): theta' F tilde{F}$$$$SU(2):theta'' F tilde{F}$$$$SU(3):theta''' F tilde{F}$$...

Asked on 06/02/2021 by ann marie cœur

0 answer

Conventional unit cell and point group symmetries?

A definition of a conventional unit cell of a lattice is one that contains the same point group symmetries as the overall lattice and is the smallest such cell. ...

Asked on 06/02/2021

3 answer

Conditions for approximating a process as isothermal

Suppose we have a cylinder filled with air and a piston on top. Say a man stands on it, then...

Asked on 06/02/2021

2 answer

Could a theory that looks like an effective field theory also be fundamental?

In the context of the standard model, I got the impression that gauge field theories are considered fundamental, and effective field theories can be derived from them for certain energy...

Asked on 06/02/2021

1 answer

On the electric field taken in the proof of the second uniqueness theorem

In the proof of uniqueness theorem, we consider $$vec{E}_3 = vec{E}_2 - vec{E_1}$$ where $vec{E_2}$ and $vec{E_1}$ are electric fields which satisfy all the boundary condition required....

Asked on 06/01/2021

1 answer

Quantum logic and Bell's Inequality

While studying quantum mechanics, I've seen two contradictory opinions about quantum logic. Some people say that it indeed defies classical logic (see Emilio Santos (1986). The Bell...

Asked on 06/01/2021 by Lemoine

0 answer

How does the piston inside the cylinder exactly behave during an isothermal expansion?

Let us say we have a perfect gas in a cylinder with a piston, with section $A$. We place the cylinder over a thermal reservoir at a certain temperature....

Asked on 06/01/2021

3 answer

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