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Physics : Recent Questions and Answers (Page 263)

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

Particle motion in earths radiation belts. Comparison of gradient drift and drift due to convection and corrotaion

I would like to know if the drift due to the gradient of the earth's magnetic field could be balanced by the sum of the drifts due to corrotation and...

Asked on 06/14/2021

0 answer

Majorana number from real space hamiltonian

Kitaev paper Can a real space 2N*2N hamiltonian of a Kitaev chain be used to get the Majorana number using Pfaffian?I am very much confused about...

Asked on 06/14/2021 by sonia rani

0 answer

Energy-momentum tensor of Bosonic Ghost Action in String Theory

When quantizing bosonic string theory by means of the path integral, one inverts the Faddeev-Popov determinant by going to Grassmann variables, yielding:$$S_{mathrm{ghosts}} = frac{-i}{2pi}intsqrt{hat{g}}b_{alphabeta}hat{nabla^{alpha}}c^{beta}d^2tau,$$where...

Asked on 06/13/2021 by Funzies

1 answer

Upper limit of neutron star mass and collapse to a black hole

I was reading answers regarding a question (https://astronomy.stackexchange.com/questions/748/how-does-neutron-star-collapse-into-black-hole) ; and I had two major questions:What is the exact lower limit mass of a black hole? Or to be more...

Asked on 06/13/2021

1 answer

Does Earth really have two high-tide bulges on opposite sides?

The bit that makes sense – tidal forcesMy physics teacher explained that most tidal effect is caused by the Moon rotating around the Earth, and some also by the Sun....

Asked on 06/13/2021

8 answer

Double source (not slit) interference pattern

In this question, I assumed that the two sources should act like the two slits in the Double Slit Experiment, and give a graph similar to this: ...

Asked on 06/13/2021 by Space_Ostrich925

2 answer

Difference between thermal density matrix and the density matrix for canonical ensemble

I am trying to understand what a thermal state is in quantum statistical mechanics. When i search for thermal state density matrix I get a bit confused. It seems like...

Asked on 06/13/2021

1 answer

Path of least resistance for water?

If water follows the path of least resistance then why when slightly tipping a glass of water it runs down the side of the cup rather than dropping straight to...

Asked on 06/13/2021 by Mike Nelson

1 answer

Why does an increase in thermal energy lead to an increase in entropy?

After reading The Preference for Low Energy States, where it is stated in the excellent accepted answer thatAs macro states with a lot of energy stored in heat (our...

Asked on 06/13/2021

1 answer

Resistance and drift velocity

I am having trouble reconciling two seemingly contradictory results. Consider two conductors, X and Y, made from the same material with the same length and carrying the same current. If...

Asked on 06/13/2021

1 answer

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