Recent content by Sunny Singh

I've been reading about the form of the energy momentum tensor for a polarizable medium in electromagnetic fields and i'm not sure if there is a scientific consensus on its form. Starting from the series of papers by Kluitenberg in the 1950s to works by Israel and Dixon in the 70s... various...

Thanks. I'll send an email to the editor today itself.

Dear All, A few days ago, my first paper in Physical Review D got accepted, but today, I found out that there is a minor mistake in the paper that changes the value of a quantity in a table. It doesn't change the final results, the physics or the paper's main point. It's just a calculation...

Thanks, i'll look into it.

This is the first one: https://arxiv.org/abs/0705.4275 and the second one: https://arxiv.org/abs/1812.08886The one book that i found which deals with this problem is: Quantum Electrodynamics by Akhiezer and Berestetskii. But given that the problem statement seems so simple i thought this must...

I am a beginning graduate student and I've been assigned a paper which uses landau levels for 3d fermionic gas in uniform background magnetic field. I am having trouble finding a proper source which deals with solution of dirac equation in such a case. With the two papers that i have found which...

I have just started reading Neilson and chuang's book on quantum computing and two times already have they said that when a qubit is not observed, it can contain infinite information. "How much information is represented by a qubit? Paradoxically, there are an infinite number of points on the...

If τ is the relaxation time, τ means, on average the time between two collisions for an electron moving under a constant electric field inside a metal. Now according to the assumptions of drude model, the electron acquires an additional velocity of \frac{-eEt}{m}where t is the time elapsed since...

I was reading introduction to quantum mechanics by DJ Griffiths and while discussing the formalism of quantum mechanics, he says that if for a hermitian operator, the eigenvalues are continuous, the eigenfunctions are non-normalizable whereas if the eigenvalues are discrete, then they can be...

We know that S2 commutes with Sz and so they share their eigenspace. Now since S2 also commutes with Sx, as per my understanding, the eigenvectors of S2 and Sz should also be the eigenvectors of Sx. But since the paulic matrices σx and σy are not diagonlized in the eigenbasis of S2, it is clear...

So this means that given enough time, the system will necessarily return arbitrarily close to its initial conditions? Does it also mean that the system eventually explores the full volume of its phase space accessible to it with the constraints of energy? Can you please give me some link to...

I have just started reading chaos from the MIT OpenCourseWare and the following passage has confused me. "The sensitivity to initial conditions is important to chaos but does not itself differentiate from simple exponential growth, so the aperiodic behavior is also important. In the definition...

But sir, in case of the EPR experiment, if realism is missing, how can locality be saved since that would collapse the wave function for both observers and information has to travel instantaneously. Can you please explain this point of yours a bit further?

So if locality is violated, it does not necessarily mean that realism is out as there can be non local hidden variable theories but what if we find out that there are no hidden variables (local or non-local), that realism doesn't exist. Then according to my above logic does it necessarily...

Through Bell's inequality, we can see that any hidden variable theory of QM will have to satisfy the inequality, but as it doesn't, wave function must be the whole story and so we have to do away with realism. So when a measurement is done on one detector in the EPR experiment, the wave function...