Reputation
1,977
Next privilege 2,000 Rep.
Edit questions and answers
Badges
10 21
Newest
 Yearling
Impact
~11k people reached

Jan
17
comment Construction of the supersymmetric Faraday tensor
@QuantumDot Read Wess-Bagger. The answer is there.
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.
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.
Jul
14
comment About 2+1 dimensional superconformal algebra
1) The right matrices to use depend on the quantum states. What you wrote down is not OK even in a single superconformal multiplet. How did you determine which matrix representations of SO(N) and SO(2,1) to use?
Jan
2
comment General Relativity research and QFT in curved spacetime
@Kyle: That's also an interesting subject, but I meant this type of things: arxiv.org/abs/0905.4352
Dec
29
comment Wilson/Polyakov loops in Weinberg's QFT books
I don't know if it's in it or not (look for "area law" or "confinement" in it). Note that you and I may think this topic as classic, but I guess it can be too modern a topic for him. Anyway, just stop regarding his book as sacred.
Nov
19
comment “finite” QFTs and short-distance singularities and vanishing beta functions
@Anirbit , even in free field theory there's a loop integral which diverges: i.e. a one-loop diagram without any vertex. This corresponds to the zero-point energy of free oscillators, which makes the partition function diverge in the UV. So, your points 1,2,3 already apply to the theory of one free boson, and are always there.
Nov
18
comment “finite” QFTs and short-distance singularities and vanishing beta functions
Please rephrase your question. Even a theory of free bosons $\phi$ has a short distance singularity in its two-point function $\langle \phi(x)\phi(y)\rangle$.
Nov
3
comment How to prove quantum N=4 Super-Yang-Mills is superconformal?
Your argument is definitely nicer :)
Oct
28
comment Miura transform for W-algebras of exceptional type
By improving the program now the expression is about ~0.9MB :)
Oct
27
comment Miura transform for W-algebras of exceptional type
Thanks, I managed to get the generators. The degree-9 one was not so bad; but the degree-12 one, when dumped to a file, has ~ 100MB as an expression. Oh Buddha.
Oct
26
comment Miura transform for W-algebras of exceptional type
Thanks everyone; I know got the generators at degree 2 and 5. Now I need those at degree 6, 8, 9 and 12 :p
Oct
26
comment Miura transform for W-algebras of exceptional type
Yes you're right. Physicists cover their lack of deep thinking by lots of explicit calculation:p I've been using that approach to find generators of W(E6), but that's still quite messy. That's why I asked the question here.
Oct
26
comment Miura transform for W-algebras of exceptional type
Thank you, but my main problem is to explicitly write down the subalgebra commuting with the screening operators. For A and D, it's done by Fateev-Zamolodchikov and Fateev-Lukyanov. Their forms are quite useful because it can be readily implemented in a computer algebra system. I just want to perform a few stupid calculation inside W-algebra of type E6, but I first need to realize it inside computer.
Oct
23
comment Paper listing known Seiberg-dual pairs of N=1 gauge theories
Ah, I see. Then I'll award him the bounty, but I don't accept his answer!
Oct
23
comment Paper listing known Seiberg-dual pairs of N=1 gauge theories
I agree. I think Urs deserves many points anyway through his contribution to tp.se at large, so I "accept" his answer :)
Oct
23
comment Paper listing known Seiberg-dual pairs of N=1 gauge theories
@Joe I knew that the list doesn't exist in the literature, that's why I asked here :p I learned that I should've asked this question after the tp.se community grew up more.
Oct
22
comment Paper listing known Seiberg-dual pairs of N=1 gauge theories
@Urs: That paper by Mukhopadhyay and Ray only talks about SU groups, so your characterization of it as about "non-exceptional" sounds a bit off the point to me. Also, on your ncat page, you say Seiberg duality is formalized as derived equivalences of quivers, but mathematical quivers are again only for U or SU groups... I don't understand why most of the mathematicians only care about U(N) quivers. They can easily analyze SO or Sp quivers, can't they???