Physics Questions, Problems & Solutions : TransWikia.com ~ Page 224

Are there two different ways to express the position operator $x$ in terms of the creation and annihilation operator?

As we known, to express the position operator $x$ in terms of the creation and annihilation operator $a^{+}$ and $a$, one way is:$$x= sqrt{frac{hbar}{2muomega}}(a^++a);$$ ...

Asked on 06/30/2021 by jiadong

1 answer

Is the force due to gravity between two objects immersed in a fluid correctly given by$ -G(M_1-m_1)(M_2-m_2)/r^2$? ($m$ = mass of displaced fluid)

There seems to be general disbelief over this formula, so I'm challenging someone to show me the fallacy in the proof below. The assumptions are that the...

Asked on 06/30/2021

3 answer

Deriving 2D Coulomb potential from Born approximation

It is known that one could recover electrostatic Coulomb potential from QED as a nonrelativistic Born approximation. The 3D case could be found in the standard textbook P&S Intro to...

Asked on 06/30/2021 by EliC

0 answer

Relative Velocity and Mass

Under what conditions can you just add velocities? For example if I throw a paper ball in the air in a 1m/s wind the ball should move in that...

Asked on 06/30/2021 by jake walsh

2 answer

How are unitary representations different from other representations?

I understand that unitary representations arise naturally in quantum mechanics when groups act on the Hilbert space in a way that preserves probability. I don't understand what details make unitary...

Asked on 06/30/2021

3 answer

What is the gravitational force between monopoles?

Domain walls have the unusual property that they are gravitationally repulsive (See reviews by Sikivie). Does a similarly strange result hold for monopoles?...

Asked on 06/30/2021 by user256436

1 answer

Are there any viable replacements for Indium-Tin Oxide electrodes?

I am looking to obtain a metal oxide ceramic that can be synthesized from a Sol-Gel procedure that is both conductive and flexible. Indium-Tin oxide does apply in this case,...

Asked on 06/30/2021

0 answer

Principle of fibre optic cable coating

I was reading about fibre optic cables and it was mentioned that ,the individual "light pipes" are coated with a material whose refractive index is less than that of that...

Asked on 06/30/2021

2 answer

Paper listing known Seiberg-dual pairs of ${cal N}=1$ gauge theories

Is there a nice list of known Seiberg-dual pairs somewhere? There are so many papers from the middle 1990s but I do not find comprehensive review. Could you suggest a...

Asked on 06/30/2021

3 answer

Atmospheres and oceans on lower gravity planets

Using Earth as an example, how much less gravity could the planet exert and still retain its atmosphere and oceans? Or is it a matter of size, mass, magnetosphere, place...

Asked on 06/30/2021

0 answer

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