Vibert
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 Nov 19 awarded Yearling Nov 3 awarded Nice Answer Nov 19 awarded Yearling Sep 29 awarded Pundit Sep 2 awarded Nice Answer Mar 2 comment Correlation Function of ground state; Physical Meaning You already found the answer yourself! Mar 2 comment Energy difference between symmetric and antisymmetric wavefunctions There is some confusion in your question. Either you mean a one-particle system that is symmetric w.r.t. some point or hypersurface, or you mean a multi-particle state (in Fock space), built out of one-particle states in a symmetric/antisymmetric way. In that case you're describing not one, but several particles. Feb 26 comment Partition Function of a three state particle system Look, just make a minimum effort at answering the question - that's standard homework policy here. Feb 25 comment Intrinsic parity of particle and antiparticle with spin zero Just a remark, but your answer assumes that we're dealing with a Klein-Gordon field. OP's question is about a general scalar particle. Feb 17 comment Does $c = 0$ implies that the theory is “empty”? No, here I define $c$ as follows: $\langle T(x) T(0) \rangle = c / (x^2)^d$ (omitting indices). Maybe you need an extra factor of $1/2$ to agree with other people's conventions. Feb 17 answered Does $c = 0$ implies that the theory is “empty”? Feb 16 comment Normal to the Hypersurfaces The equation $n^a n^b n^c = 0$ is definitely false. It can only be true if $n^a = 0.$ Maybe you mean $\epsilon_{abcd} n^a n^b n^c = 0$ which is true, but for trivial reasons. Feb 14 awarded Nice Answer Feb 14 answered If the quarks in a neutron are (up,down,down), why isn't it negatively charged? Feb 9 comment Use of 'complete' as in 'complete set of states' or 'complete basis' I've never heard someone use the word basis in that Hamel sense (in physics). It seems unnatural. Take some Hamel basis $\{ | \psi_n\rangle \}$ and assume that the $| \psi_n\rangle$ have unit norm. Now what about the state $\sum e^{-n} | \psi_n \rangle$? Feb 2 suggested rejected edit on Closed formula for product of gamma matrices Jan 30 comment Do primary fields (in a CFT) satisfy the wave equation? You didn't understand my equation, so please don't downvote because of ignorance. The full propagator is obviously $G(z,\bar{z}) = z^{-2h} \bar{z}^{-2\bar{h}}.$ This is really elementary CFT... Jan 30 answered Do primary fields (in a CFT) satisfy the wave equation? Jan 25 answered Energy spectrum, mass spectrum, and mass gap Jan 24 comment Are atoms getting weaker? For sure the Planck length will turn up in your calculation; my point is that any correction coming from from the expansion of the universe should actually depend on the rate of expansion (and maybe some other cosmological data).