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    Question on Tachyon Correlator (Green Schwarz Witten)

    Thanks fzero! Since both - Trimok and you - suggested to look at Polchinksi I will do so :) To the Library...!
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    Question on Tachyon Correlator (Green Schwarz Witten)

    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... :)
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    Question on Tachyon Correlator (Green Schwarz Witten)

    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...
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    Question on Tachyon Correlator (Green Schwarz Witten)

    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...
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    Closed Strings and Virasoro algebra

    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
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    Closed Strings and Virasoro algebra

    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...
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    Primer on conformal / dual conformal symmetry

    Alright, thank you all! Now i have plenty to read :)
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    Primer on conformal / dual conformal symmetry

    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...
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    Question on Witten's paper: Perturbative Gauge Theory As A String Theory

    Thanks for your help! That solved my problem :)
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    Question on Witten's paper: Perturbative Gauge Theory As A String Theory

    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...
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    Superfield Expansion

    Sorry, i had no internet in the past week. Thank you for your answer :)
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    Superfield Expansion

    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 +...
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