TY - JOUR
T1 - Decoupling A and B model in open string theory: topological adventures in the world of tadpoles
JF - JHEP 06 (2009) 046
Y1 - 2009
A1 - Giulio Bonelli
A1 - Andrea Prudenziati
A1 - Alessandro Tanzini
A1 - Yang Jie
AB - In this paper we analyze the problem of tadpole cancellation in open topological strings. We prove that the inclusion of unorientable worldsheet diagrams guarantees a consistent decoupling of A and B model for open superstring amplitudes at all genera. This is proven by direct microscopic computation in Super Conformal Field Theory. For the B-model we explicitly calculate one loop amplitudes in terms of analytic Ray-Singer torsions of appropriate vector bundles and obtain that the decoupling corresponds to the cancellation of D-brane and orientifold charges. Local tadpole cancellation on the worldsheet then guarantees the decoupling at all loops. The holomorphic anomaly equations for open topological strings at one loop are also obtained and compared with the results of the Quillen formula.
UR - http://hdl.handle.net/1963/3632
U1 - 672
U2 - Physics
U3 - Mathematical Physics
ER -