Thanks Trimok for clearing that up :) As mentioned on phys stackexchange, I would like to understand this, since GSW say in the appendix that getting 7.A.17 is possible from 7.A.12 and 7.A.22... :)
Hi fzero,
Thanks for your answer but I'm not sure I understand it in the context of the equations above. Would you be so could to make it more precise w.r.t. the formulae I used above. That would be very nice since i'm banging my head against this for a while now. Moreover, this point is...
I'm reading through chapter 7 of Green-Schwarz-Witten and I have a problem with the derivation of the M-tachyon correlation function. Basically I'm trying to get 7.A.17 from 7.A.12 and eq 7.A.22 in the appendix of the first volume.
Basically I want to prove...
Hey, thanks for the answer. We had exactly this reasoning today in our lecture but we only DEFINED that L_n with n>0 vanishes. Is there a physical argument for that that makes this definition somehow intuitively accesible? I mean, why do we only require that n>0 vanishes and not all n?
Cheers
Hey guys,
i just started taking a course on ST and so far we discuss the closed string following Green, Schwarz, Witten.
I don't see the point of constructing the Virasoro algebra (formula 2.1.85 in GSW) if the corresponding generators are zero due to the constraints. Or to put it differently...
Hey guys,
i am looking for some primer on conformal, dual conformal symmetry, respectively. I have to read a lot of stuff about scattering amplitudes for uni and in recent papers people talk a lot about these symmetries.... unfortunately i am not so familiar with them, so does any of you know...
Question on Witten's paper: "Perturbative Gauge Theory As A String Theory..."
Hi guys,
I have a question regarding formula 2.12 of Witten's paper hep-th/0312171
"Perturbative Gauge Theory As A String Theory In Twistor Space". He just states this formula but i don't really understand his...
Hi folks,
I just read some stuff about Susy and encountered superfields and their expansion in terms of the supercoords x^\mu, \theta, \bar{\theta}. Reading that (e.g. in the script of Lykken), I found general expansions like
S(x,\theta,\bar{\theta})=...+ \theta\theta \psi +...