1
vote
0answers
46 views

Polchinski 12.3.22 - superspace green's function

Forming the supersymmetric string using superfields and superspace, Polchinski claims that the function $$ G \sim \ln{\left|z_{1} - z_{2} - \theta_{1}\theta_{2}\right|^{2}} $$ satisfies the equation ...
2
votes
0answers
30 views

Physical interpretation of categorical structures related to Dirichlet Branes

In Dirichlet Branes and Mirror Symmetry by Aspinwall et al, section 5.9 discusses various questions that remain open. In particular they say: "There are many constructions from homological ...
2
votes
0answers
77 views

Status of a question from Freeman Dyson's 1972 article

In a famous article, Freeman Dyson mentions an interesting relationship between the $\tau$ functions of number theory and the dimensions of finite-dimensional simple Lie algebras (section 2). He ...
1
vote
1answer
40 views

Strange factor multiplying the fermionic part in the NS mass-squared operator?

In the Neveu-Schwarz sector, the worldsheet fermions can be expanded as $$ \psi^I(\tau,\sigma) \sim \sum\limits_{r\in Z+1/2}b_r^Ie^{-ir(\tau-\sigma)} $$ and the total mass squared operator can then ...
2
votes
1answer
194 views

What is a good gentle introduction to the Virasoro algebra and its application in theoretical physics?

I am looking for an as gentle and pedagogical as possible introduction that explains the Virasoro algebra and its applications in theoretical physics; finally I am interested in its application in ...
10
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0answers
454 views

What Areas Should a Potential String Theorist Study at Graduate Level? [closed]

Next October I start a year long course in Cambridge, intended as preparation for a PhD. I chose mainly pure disciplines as an undergrad (particularly topology and analysis) but I'd really like to ...