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In the Book "Elementary Particles" by Griffiths, Chapter 7.8 describes pair annihilation amplitude for $e^+e^- to gamma gamma$. To obtain the final amplitude for the singlet state, he needs...
Asked on 05/18/2021 by Asanovic Tomas
1 answerThere is an important inequality in thermodynamics which states that TdS>=dQ, where T is the temperature of the system in question (or, more generally, the temperature of the surroundings), dS...
Asked on 05/18/2021
0 answerI was reading a paper about the theory of the AC Stark effect, and I was struck by the following assertion:For instance, the first observation of the...
Asked on 05/18/2021
1 answerConsider the dynamical system $$dx/dt = -cos(r)sin(x)$$ Clearly $x=0$ and $x=pi$ are two fixed points of this system.The stability of these two fixed points...
Asked on 05/18/2021 by Sneha Srikanth
1 answerThere are $2$ convenient metric signatures: (-,+++) and (+,---). If one considers the integral action:$$S=frac{1}{16 pi G_n} int d^4x sqrt{-g} [R-2Lambda-F_{mu nu}F^{mu nu}],$$is it...
Asked on 05/18/2021 by Belgium_Physics
1 answerThe Reynolds number is given by $$mathrm{Re} = frac{v_{rms} L}{nu}$$ Now imagine we fix $L$, $nu$ and $v_{rms}$ - so the Reynolds number is constant. Imagine...
Asked on 05/18/2021 by Thomas Wagenaar
0 answerIf liquid in a pipe is not moving, has a pressure of $x$ Pa, a diameter of $d_1$ meters, and an open close valve of $d_2$ meters,...
Asked on 05/18/2021 by math314
1 answerCan someone explain to me how the magnetic field cancels outside a solenoid of infinite length mathematically (using an integration or something)?...
Asked on 05/18/2021 by sriram B
5 answerI am taking a class in fluid mechanics right now and my book has this statement with no explanation:What is the time derivate seen by an observer moving with a...
Asked on 05/18/2021
1 answerI am having trouble with the units used in the Hamiltonian of the Ising model. I have search several notes, I have three examples in the picture below No one...
Asked on 05/18/2021
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