2011/06/16 by Katrin Becker, Guangyu Guo, Daniel Robbins · 1 voice
Physics and Astronomy · Social Sciences · #Black Holes and Theoretical Physics #International Science and Diplomacy #Quantum and Classical Electrodynamics #hep-th
paper · pdf · doi:10.1007/jhep01(2012)127
arxiv published 2011/06/16 · arxiv updated 2011/06/16 · openalex publication_date 2012/01/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study in detail the procedure for obtaining couplings of D-branes to closed string fields by evaluating string theory disc amplitudes. We perform a careful construction of the relevant vertex operators and discuss the effects of inserting the boundary state which encodes the presence of the D-brane. We confront the issue of non-decoupling of BRST-exact states and prove that the problem is evaded for the computations we need, thus demonstrating that our amplitudes are automatically gauge-invariant and independent of the distribution of picture charge. Finally, we compute explicitly the two-point amplitudes of two NS-NS fields or one NS-NS and one R-R field on the disc, and we carefully compare all the lowest order terms with predictions from supergravity.