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Suppose we have a process with two particles in and two particles out. The amplitude for such process is given by $$ M_0 (2pi)^4 delta(p'+l_2-l_1-p)+M_1 (2pi)^4 delta_{1,2,-}(p'+l_2-l_1-p)delta_+'(p'+l_2-l_1-p)$$ where ...
Asked on 06/02/2021
0 answerI've always seen beats to be produced when two waves are said to be moving in the same direction with different frequency. Can beats be produced by addition of waves...
Asked on 06/02/2021
3 answerI would like to know if there is any physical model in which the generating function of the Hermite polynomials arises, I know the problem of the quantum harmonic oscillator...
Asked on 06/02/2021 by Lluis Gerardo
1 answerThere are several answers on this site and elsewhere about why the sky is blue and why sunsets are reddish. But I could not find anything that discusses the relationship...
Asked on 06/02/2021
1 answerWiens's displacement law says $$λ_{text{max}}T=text{a constant}$$So if I have the $λ_{text{max}}$, I can find the temperature of a star. But if I have the temperature, is there...
Asked on 06/02/2021 by Bob the Turtle
1 answerSituationI've taken a course on QFT, covering canonical quantization (of the scalar, EM and Spinor fields), Feynman diagrams and rules, etc. --- it was your basic one-semester introduction to QFT....
Asked on 06/02/2021
1 answerThis forum works well for its intended purpose of asking and answering factual questions, but doesn't provide an avenue for more open ended discussion of HEP theory topics for a...
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1 answerThe direction of induced emf will be opposite to increasing current ;means that its direction will be opposite to applied voltage. And the direction of induced emf due to decreasing...
Asked on 06/02/2021 by Rabik John
2 answerI read papers about the Dicke model and Rabi model. There are many discussion about $A^2$ term in circuit QED [Gu, Xiu, et al. "Microwave photonics...
Asked on 06/02/2021 by wayna
0 answerI have seen in numerous literature sources (e.g. this chapter from MIT open courseware, pages 414-415) the following method of relating the pressure to particle velocity. Begin...
Asked on 06/02/2021 by user162465
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