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Physics : Recent Questions and Answers (Page 36)

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

Usefulness of $| {rm in}rangle$ and $| {rm out}rangle$ states in S-matrix description of QFT

I am currently reading Niklas Beisert's lecture notes on QFT, Chapter 10, on the scattering matrix $S$.$^1$ My main confusion lies in the construction of...

Asked on 10/29/2021

2 answer

Cold neutrinos - how are they distributed?

Cold or slow neutrinos have non-relativistic velocities and hence very low energies. That makes them very difficult to detect. Answers to Where are all the slow neutrinos? make it...

Asked on 10/29/2021

2 answer

Partition function for 4 spins

I was reading some notes by John Chalker on order by disorder and encountered a classical spins partition function calculation. I could not follow the integration, i.e. obtaining eqn. (1.7)...

Asked on 10/29/2021

1 answer

Will magnets lose strength over time when coupled to another magnet?

Will magnets lose strength over time when coupled to another magnet ? Im designing a part (c. 200g) which needs to be held in place, but also be removable, so...

Asked on 10/29/2021

3 answer

Formulation of strong nuclear forces spin-dependent-term in larger nuclei

The nuclear force spin dependence term of deuterium is easy to explain, its was explained before in this site in question 288357. But what about larger nuclei with higher...

Asked on 10/29/2021

0 answer

How is Schwinger's quantum action principle related to least action?

The principle of least action says that a body moves in such a way that the action value $S=int L dt$ is stationary (often minimal). The...

Asked on 10/29/2021

1 answer

Can Rayleigh scattering be thought of as a special case of the Compton scattering?

The presence of the unmodified line (wavelength) in the scattered X-ray beam, in a Compton scattering experiment, is called the Rayleigh line. This line originates from the Compton scattering of...

Asked on 10/29/2021 by Solidification

1 answer

Energy-optimal beer cooling

Suppose that I am going to host a big party one month from now, and I have various liters of cold beverages that will need to be refrigerated by the...

Asked on 10/29/2021

4 answer

Do nuclei emit photons?

Generally in text books they say that when a electron goes from high energy state to a lower energy state it emits photons.My question is, it is possible that...

Asked on 10/29/2021

7 answer

How do Hamilton's equations deal with non-conservative forces?

I have searched everywhere I know to look but I cannot find out how Hamilton's equations deal with non-conservative forces. In my understanding, Lagrangian mechanics deals with this as follows:...

Asked on 10/29/2021

2 answer

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