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Physics : Recent Questions and Answers (Page 111)

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

Question with computing the chiral scalar condensate in lattice QCD about the dagger of the discretized fermionic propagator

My professor defined, given $a$ the lattice spacing the massive propagator according to the Wilson prescription as:$$D_m equiv D+m left( 1-frac{aD}{2} right)$$Then he computes the chrial...

Asked on 08/14/2021 by Ringo_00

0 answer

Klein-Gordon Green's Function

I am having trouble understanding the derivation presented in chapter 2 of Overview of Quantum Field Theory, in which the authors show that the a particular function, denoted as ...

Asked on 08/14/2021

1 answer

Received heat by radiation from the surroundings

In Stefan's law, the radiated energy of a black body with a temperature of $T$ is$q = sigma T^4$Where $sigma$ is Stefan's constant. However, if...

Asked on 08/14/2021 by user3733086

1 answer

Query regarding instantaneous velocity and instantaneous acceleration

Suppose an object's velocity is $5 text{m/s}$ at $t = 1$ seconds and $8 text{m/sec}$ at $t = 2$ seconds then the acceleration here...

Asked on 08/14/2021 by rahul amare

3 answer

How long will it take for a projectile to be knocked off a wall? (See details)

I am trying to calculate the impulse of an object that is thrown against a wall. Problem is, to calculate the impulse one needs to know not just the force,...

Asked on 08/14/2021 by Sophia Lily

3 answer

Ratio gap / critical temperature BCS

The ratio between the supercond. gap and the critical temperature is said to be equal to a constant in BCS theory. Is it true only for s-wave supcond (e.g. pairs...

Asked on 08/14/2021 by Derrick Rossi

0 answer

Irrotational ray systems

My question is regarding a famous publication by Sommerfeld and Runge, see the translation from the original German here 1. I am quoting in full the last...

Asked on 08/14/2021

0 answer

Complex Fields, Propagators, Wick's Theorem and Feynman Diagrams

I'm having quite the problem connecting all these concepts, so apologies for the lengthy post. Complex Fields and Feynman propagators Let $psi$ denote a complex field. Then, after quantization,...

Asked on 08/14/2021

1 answer

Galaxy Superclusters

Okay quick question... why is it that when galaxies group together in superclusters they form a sort of branch-like shape? I personally would think they’d all just group together in...

Asked on 08/14/2021 by PythonerLMAO

1 answer

How different observers measure time?

Suppose I have a coordinate system, call it $S$, in which an observer $O$ is not moving, and $O'$ is moving with constant velocity and another coordinate...

Asked on 08/14/2021

1 answer

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