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This is regarding symmetries and unitary transformations in quantum mechanics. Consider some infinitesimal continuous transformation given by $T$, where $T = 1 - frac{iGepsilon}{hbar}$. If this transformation conserves...
Asked on 12/22/2020 by newtothis
2 answerCarlo Rovelli is interviewed in this article (The illusion of time):Alongside and inspired by his work in quantum gravity, Rovelli puts forward the idea of 'physics...
Asked on 12/22/2020
2 answerI know that the voltage between two terminals of a battery causes the electrons to move through the wire, and I also know that the voltage in a circuit is...
Asked on 12/22/2020 by Omar Ali
2 answerIn the grand canonical ensemble, the equilibrium density operator is given by $$hat{rho}_{rm eq}=frac{1}{Z}e^{-betaleft(hat{H}-muhat{N}right)}, ~{rm with}~ Z={rm tr}left[e^{-betaleft(hat{H}-muhat{N}right)}right].$$ Here, $hat{H}$ is the Hamiltonian and $hat{N}$ is the...
Asked on 12/22/2020
2 answerHow do scientists know the min limit of temperature is -273 degree celsius? I wonder how do scientists confirmed that there is no place belong to less than -273 degree...
Asked on 12/22/2020 by Sazzad Hissain Khan
3 answerCan someone explain to me how I can get the cardinal points for Huygens eyepiece using the matrix method? I tried to solve it by considering two thin lenses and...
Asked on 12/22/2020 by stacks_3000
0 answerI'm getting started with AdS/CFT and there is one particular point that I'm struggling to understand. Consider the example of a scalar field $phi$ in ${rm AdS}_{d+1}$. In...
Asked on 12/21/2020 by user1620696
0 answerI'm learning about inflation and tensor perturbations during it. I've read a few times that large-field inflation is "more important" with respect to inflation as it produced bigger tensor perturbations...
Asked on 12/21/2020 by baker_man
1 answerI am reading this article The use of basis splines and non-orthogonal orbitals in R-matrix calculations: Application to Li photoionization At some point they span a wave...
Asked on 12/21/2020
0 answerI am reading Weinberg's book Quantum theory of fields. Could you explain to me the following things? Vol.1, page 60 (transcribed from this image):To first order...
Asked on 12/21/2020 by Aleksandrochka
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