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Physics : Recent Questions and Answers (Page 337)

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

Behavior of the electric field of an incoherent light wave

If I am not mistaken, an incoherent light wave is a light wave made out of waves with random phases: it consist of photons with random phases. Now I...

Asked on 05/14/2021 by Simon DK

1 answer

What does the notation $^1 S_0$ represent in particle physics?

I'm coming across the notation $^1 S_0$, $^3 P_1$, $^1D_2$ etc. in relation to particle states. What do the two numbers and the letter represent? I've tried...

Asked on 05/14/2021 by P4PL4

1 answer

How does one define massive Higgs-ed gauge fields nonperturbatively?

The Higgs mechanism can be used to produce massive spin $1$ particles in a unitary and renormalizeable way. Showing that the gauge fields gain a mass is always done...

Asked on 05/14/2021

1 answer

Difference in equations from four-vector conservation

This is a question, kind of related to my previous question but is here as a stand-alone. I've been reading the book 'essential relativity' by Rindler and have a...

Asked on 05/14/2021

1 answer

Lie Superoperator Algebra Commutation relations

I am trying to derive commutation relation of Lindblad Superoperator relations.They are defined as:$$cdot a^{dagger}a=mathcal{L}$$$$a^{dagger}acdot =mathcal{R}$$$$acdot a^{dagger}=mathcal{M}$$ I try to derive this commutation...

Asked on 05/14/2021 by Andris Erglis

0 answer

Does such a variant of the large-scale structure of the Universe make sense?

Although the observed universe is considered homogeneous, there are small local inhomogeneities in it. These are galaxies with higher density, and voids with lower density. In the region of galaxies,...

Asked on 05/14/2021

0 answer

Friction caused by acceleration on a rocket sled

I'm trying to quantify some intuition I have about friction and rocket sled.Suppose a rectangular sled with length $l$, weight...

Asked on 05/14/2021 by Henry Oh

2 answer

How long does it take to equalize pressure of two gas containers?

I'm looking for an equation that will tell me how long it takes for two gases at two different pressures to equalize their pressures. As a more concrete question, Container...

Asked on 05/14/2021

4 answer

What is the status on quantum information (processing, communication...) in infinite-dimensional Hilbert spaces?

In canonical references for learning quantum information, such as Nielsen's Quantum Computation and Quantum Information and Preskill's lecture notes, the focus seems to be on systems with finite-dimensional Hilbert spaces....

Asked on 05/14/2021 by Rodo

0 answer

The quantisation of the harmonic oscillator applied to the free Klein-Gordon field

In David Tong's lecture notes on quantum field theory, at the bottom of page 23, we are applying the quantisation of the harmonic oscillator to the field...

Asked on 05/14/2021

0 answer

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