1,849 reputation
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bio website member.ipmu.jp/yuji.tachikawa
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visits member for 3 years, 2 months
seen Apr 7 at 11:02

As an occupation, I'm a mathematical physicist, studying string theory and quantum field theory.

I've developed as a hobby a few Cocoa (Touch) apps. The largest one so far is spires.app, which manages articles and metadata downloaded from the arXiv eprint server, the inspire database, and the journal websites.

I'm also interested in many other things, which is why I ask questions in various StackExchange sites ...


Feb
11
awarded  Yearling
Nov
16
revised Charge-conjugation of Weyl spinors
added equation numbers so that I can answer the question easily
Nov
16
awarded  Editor
Nov
16
revised Amplitudes in renormalized perturbation theory
correction
Nov
16
answered Charge-conjugation of Weyl spinors
Nov
16
suggested suggested edit on Charge-conjugation of Weyl spinors
Nov
16
answered Pre-gauge-fixed superspace action of the RNS superstring
Nov
16
answered Amplitudes in renormalized perturbation theory
Sep
7
awarded  Good Question
Aug
20
answered Quantum Anomalies in Non-Gauge Theories?
May
12
answered Motivation for the Deformed Nekrasov Partition Function
Feb
11
awarded  Yearling
Jan
17
comment Construction of the supersymmetric Faraday tensor
@QuantumDot Read Wess-Bagger. The answer is there.
Jan
10
awarded  Enlightened
Jan
10
awarded  Nice Answer
Nov
3
comment Is there a theorem that says that QFT reduces to QM in a suitable limit? A theorem similar to Ehrenfest's theorem?
@Prathyush Ask as a separate question. That's how stackexchange works.
Aug
18
asked Reflection positivity in general
Jul
16
comment About 2+1 dimensional superconformal algebra
Now that you understand that point, I think you should stop asking and think for several days by yourself. Good luck!
Jul
16
comment About 2+1 dimensional superconformal algebra
You need to distinguish two questions: what is the representation of the supercharge and what is the representation of the quantum states the supercharge is acting on. In order to get the inequality you're interested, you need to consider the latter question. You can't fix $I$ to be $N\times N$ and $M_{\mu\nu}$ to be $2\times 2$. They depend on $h$ and $j$. You try extracting $j$ from the $M_{\mu\nu}$ you already fixed, but that's not the point. $j$ depends on the quantum states.
Jul
14
comment About 2+1 dimensional superconformal algebra
2) Right. 3) The author didn't say Gamma are all real, he just said sigma is real. 4) You need to understand that the matrices M are determined by j and that the metrices $I$ are detemined by h.