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It has been pointed out in a previous post that the convention used for the gauge covariant derivative tends to be different in nearly every textbook. As was pointed...
Asked on 02/23/2021
1 answerIn a particular reference frame with coordinates $x^mu$, we can define a current density 4-vector $J^mu=(crho,vec{J})$ where $rho$ is the charge density and $vec{J}$ is the...
Asked on 02/23/2021
2 answerSo I have been trying to derive the equations of motion of the inverted physical pendulum in a cart, but I seem to be confused about the derivation of its...
Asked on 02/23/2021 by gilbertocunha
1 answerThanks for looking into this question and for your patience since I am just learning all of this stuff. I have a bi-partite state (density matrices with trace 1 and...
Asked on 02/22/2021 by Fibonacci M
1 answerI've been trying to approximate the drag coefficient based on a frontal shape of an object. here's what I've come up with. We can represent the shape of an object...
Asked on 02/22/2021 by Evgeny Sizov
0 answerWe have a situation in which we deliberately let the magnetic field lines pass through only half of the area of the loop. So, while calculating magnetic flux do we...
Asked on 02/22/2021
1 answerLet's say we have a material $AB$. Is it possible to detect atomic clusters of A atoms experimentally? The size of clusters in question: 2 atoms (nearest neighbour (nn)...
Asked on 02/22/2021 by Hitanshu Sachania
0 answerFollowing my book I came to know the following expressions for the position and momentum operators ($hat{x},hat{p}$):begin{align}&langle x|hat{x}|psirangle=xpsi(x) &(1)\[1.5ex]&langle x|hat{p}|psi rangle=-ihbarfrac{d}{dx}psi(x)...
Asked on 02/22/2021
3 answerAn operator $W=lambdavec{S}cdotvec{r}$ is given, and I've to find his selection rules.First of all, I know that $Delta j = 0$ and $Delta m_j=0$ because the...
Asked on 02/22/2021 by Konstantin Khrizman
0 answerI don't know very well what a dilaton field is, but as far as I understand it is something that follows from the existence of strings in string theory. There...
Asked on 02/22/2021
1 answerGet help from others!
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