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Is there a way in which the conservation law of the energy momentum tensor $nabla _nu T^{munu}=0$ can be written in integral form using Stokes' theorem, namely as...
Asked on 07/22/2021 by user341440
1 answerIf we shine light on an electron wave passing through a double slit then the interference pattern is destroyed. This is now understood as decoherence coming from interaction of the...
Asked on 07/22/2021
3 answerI'm doing mechanics and I came across this question:A ball of mass 0.2 kg is dropped from a height of 2.5 m above horizontal ground.After hitting the ground it...
Asked on 07/22/2021 by Logan545
3 answerThis relates to page 111 in Peskin and Schroeder. We have the $phi^4$ S-matrix for a 2-particle to 2-particle scattering reaction: $$-ifrac{lambda}{4!}int d^4x langle p_1p_2|mathcal Tleft(phi(x)phi(x)phi(x)phi(x)right)|p_Ap_Brangle tag{4.90}$$ For...
Asked on 07/22/2021
1 answerHere is the section of the book I'm talking about. I'm confused about the following two points:(i) Why is the path integral oscillatory?(ii) What does it mean, "we can deform...
Asked on 07/22/2021 by user175911
0 answerConsider the linear Schrodinger equation$$begin{cases}ipartial_t u + Delta u =0,u|_{t=0}=u_0,end{cases},tinmathbb R,xin mathbb R^n, uin mathbb C.$$If $v$ is a solution...
Asked on 07/22/2021
0 answerCan r just be the distance from an object center of mass to the axis of rotation? If not, it will be very hard to calculate r for things that...
Asked on 07/22/2021 by most venerable sir
2 answerI would like to make a scattering toy simulation as a computational physics project. I'm having issues visualizing which parameter of the scattering function I need to compare with the...
Asked on 07/22/2021 by jaspior
0 answerIn Walter Greiner book about relativistic quantum mechanics, he writes the uncertainty relations for 4-position and 4-momentum in a neat way as: $$[p^mu, x^nu] = ihbar eta^{munu}{bf 1}$$ with...
Asked on 07/22/2021
0 answerI have just finished reading about biasing in pn junctions. I learnt that in forward biasing, the external electric field applied slowly neutralizes the depletion layer and a current is...
Asked on 07/22/2021
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