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Jia Yiyang's user avatar
Jia Yiyang's user avatar
Jia Yiyang's user avatar
Jia Yiyang
  • Member for 12 years, 7 months
  • Last seen more than a week ago
  • Stony Brook
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I'm no longer active on physics stackexchange.

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Top posts
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38
Is it really proper to say Ward identity is a consequence of gauge invariance?
Jul 12, 2013
23
EM wave function & photon wavefunction
May 19, 2012
23
Time ordering and time derivative in path integral formalism and operator formalism
Jul 23, 2013
22
Topological insulators: why K-theory classification rather than homotopy classification?
Mar 19, 2014
21
Can we "trivialize" the equivalence between canonical quantization of fields and second quantization of particles?
Nov 18, 2013
19
What's the relation between perturbative and nonperturbative QFT?
Jul 31, 2012
18
A curious issue about Dyson-Schwinger equation (DSE): why does it work so well?
Aug 21, 2013
18
When can we take the Brillouin zone to be a sphere?
May 6, 2014
16
Why do many people say vector fields describe spin-1 particle but omit the spin-0 part?
Dec 25, 2012
15
single-particle wavepackets in QFT and position measurement
Nov 4, 2013
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Why did my comments under the community ad for physicsoverflow get deleted thrice?
12
Community Promotion Ads - 2015
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62
Why do differential forms have a much richer structure than vector fields?
11
Is every complex Lie algebra a complexification?
10
If $e^A$ and $e^B$ commute, do $A$ and $B$ commute for finite dimensional matrices?
8
How does a geometry-oriented mind learn analysis?
5
What are the orthogonal polynomials with respect to the weight $2\cosh(\beta x)e^{-x^2}$?