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Nov
22
comment Counting D0-D4 Bound States
Thanks @Ryan! This is very helpful. One minor correction: I think you meant (1-q)^(-8) for the bosonic counting instead of (1-q)^(8).
Nov
21
asked Counting D0-D4 Bound States
Nov
15
answered SUSY's Critical role in String Theory
Nov
7
comment Why do three dimensional gauge theories flow to conformal theories in the infrared?
Oh, I see what you were saying, David. I guess you meant that Luty, Polchinski, and Ratazzi can throw away their assumption of scale implies conformal, since this is now proven. Thats interesting, thanks!
Nov
6
comment Why do three dimensional gauge theories flow to conformal theories in the infrared?
No, they prove that if you look at any field theory (massless or not) at high enough or low enough energies, then it looks like a CFT. This is what I mean by UV and IR.
Nov
6
comment Why do three dimensional gauge theories flow to conformal theories in the infrared?
I know that Dymarsky et al also had a paper on that, but isn't that a different result? It seems to me that that doesn't constrain the RG flow of a general field theory, it just looks at scale invariant theories.
Nov
6
revised Why do three dimensional gauge theories flow to conformal theories in the infrared?
added 21 characters in body
Nov
6
comment Why do three dimensional gauge theories flow to conformal theories in the infrared?
You're right about the dimensionality and Lorentz invariance, I edited this in. It doesn't have to be weak coupling, as long as you assume that scale invariance implies conformal invariance. It doesn't have to be massless, and it's almost always not.
Nov
6
comment Why do three dimensional gauge theories flow to conformal theories in the infrared?
(To clarify, it is the assumptions that are weak and not the authors.)
Nov
6
answered Why do three dimensional gauge theories flow to conformal theories in the infrared?
Nov
5
comment Ghosts on Torus worldsheet
It would be hard to explain it better than chapter 5 of Polchinski. I would recommend that to you.
Nov
5
answered Ghosts on Torus worldsheet
Aug
23
comment Generalisations of AdS/CFT with string theory on both sides
Why do you say that T-duality is holographic?
Aug
11
revised Why is it hard to give a lattice definition of string theory?
added 38 characters in body
Aug
11
asked Why is it hard to give a lattice definition of string theory?
Aug
11
answered How to obtain the constant $a^g$ in Eq.(2.7.19) in Polchinski's string theory book
Aug
9
awarded  Yearling
Aug
6
awarded  Enthusiast
Aug
4
asked Peierls Argument for Absence of Long Range Order
Aug
2
comment How are low energy effective actions derived in string theory?
That's right, the two are equivalent. I think you should be able to understand the effective action by reading Polchinski, but that paper by Callan etc. might help also.