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Jia Yiyang

I'm no longer active on physics stackexchange, partly due to the decline of the quality of the site and partly due to the abuse of moderation power. See this meta post.

If you need contact me, please send me an email or find me at www.physicsoverflow.org

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29 Is it really proper to say Ward identity is a consequence of gauge invariance? Jul 12 '13
20 EM wave function & photon wavefunction May 19 '12
18 Time ordering and time derivative in path integral formalism and operator formalism Jul 23 '13
18 Topological insulators: why K-theory classification rather than homotopy classification? Mar 19 '14
17 Can we “trivialize” the equivalence between canonical quantization of fields and second quantization of particles? Nov 18 '13
16 A curious issue about Dyson-Schwinger equation(DSE): why does it work so well? Aug 21 '13
16 What's the relation between perturbative and nonperturbative QFT? Jul 31 '12
16 When can we take the Brillouin zone to be a sphere? May 6 '14
12 single-particle wavepackets in QFT and position measurement Nov 4 '13
12 Non-covariance of the higher rank propagator (from Weinberg's QFT textbook) Feb 21 '13
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