TransWikia.com
  1. All Categories
  2. Physics

Physics : Recent Questions and Answers (Page 343)

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

What's wrong with using protium catalytically in a fusion reactor?

P-D fusion results in 3He, then D-3He results in a P+D+D turning into P+4He. Isn't that net energy positive at a relatively low temperature without too many neutrons? Some D+D...

Asked on 05/12/2021 by Bram Cohen

0 answer

QFT: Higgs mechanisms covariant derivative under gauge transformation

So we have a Maxwell field coupled to a complex $Phi(x)$(charged) scalar field with mass and self-interaction terms: $$L=-frac{1}{4}F_{munu}F^{munu}+D_{mu}Phi^*D^{mu}Phi-m^2Phi^*Phi-frac{lambda}{6}(Phi^*Phi)^2 $$ Determine the exact form of the covariant derivative $D_{mu}$...

Asked on 05/12/2021

1 answer

Can a single electron slide down a smooth glass incline plane?

It is said that there are detectors that can detect the impact of a single charged particle in transmission electron microscopy (TEM) that do not rely in the conversion of...

Asked on 05/12/2021

1 answer

Why isn't $g^{mu nu}partial_{nu}$ equal to $partial^{mu}$ in General Relativity?

The question is pretty short. I have been told that unlike for flat spacetime, in curved spacetime we cannot write $g^{mu nu}partial_{nu}f=partial^{mu}f$ With $f$ an scalar function, but...

Asked on 05/12/2021 by alexsanchezcast

3 answer

$mathcal{PT}$ symmetry is a weaker condtion for a Hamiltonian than Hermicity?

In this paper by Bender (end of page 3), he says:And, because PT-symmetry is a weaker condition than Hermiticity, there are infinitely many Hamiltonians that are PT-symmetric...

Asked on 05/12/2021

0 answer

Time reversal symmetry for Newton's second law with time-dependent potential

It is clear that there is time reversal symmetry for Newton's second law if we have time-independent potential $V(x)$. However, it seems that we still have time reversal symmetry...

Asked on 05/12/2021

2 answer

Compactness condition on boundary formalism for loop quantum gravity

I'm going over Rovelli's Covariant Loop Quantum Gravity notes http://www.cpt.univ-mrs.fr/~rovelli/IntroductionLQG.pdf and in section 2.4.2 "Boundary formalism" he briefly develops how to think about quantum fields in...

Asked on 05/12/2021 by Fiter

1 answer

What distinguished physical and pseudo-forces?

Why are some forces are considered pseudo-forces while some are considered real or physical forces? The definition of pseudo-forces that I know of is that they exist in noninertial reference...

Asked on 05/12/2021

9 answer

Inductor EMF direction

I have some serious troubles with understanding the EMF in inductor.Assume we change the current from value $I_0$ to zero by rotating the tumbler of the source.Then...

Asked on 05/12/2021

1 answer

Probability amplitudes in Feynman's path integral formalism

I spent the last 2 hours reading up on Feynman's path integral formalism of quantum mechanics. Now, I have a few questions, which are rather very simple, but since unconventional...

Asked on 05/12/2021 by Kabir Khanna

0 answer

Ask a Question

Get help from others!

© 2024 TransWikia.com. All rights reserved. Sites we Love: PCI Database, UKBizDB, Menu Kuliner, Sharing RPP