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Flux interactions on D-branes and instantons | | Marco Billo'
; Livia Ferro
; Marialuisa Frau
; Francesco Fucito
; Alberto Lerda
; Jose F. Morales
; | | Date: |
10 Jul 2008 | | Abstract: | We provide a direct world-sheet derivation of the couplings of NS-NS and R-R
fluxes to various types of D-branes (including instantonic ones) by evaluating
disk amplitudes among two open string vertex operators at a generic brane
intersection and one closed string vertex representing the background fluxes.
This world-sheet approach is in full agreement with the derivation of the flux
couplings in the brane effective actions based on supergravity methods, but it
is applicable also to more general brane configurations involving fields with
twisted boundary conditions. As an application, we consider an orbifold
compactification of Type IIB string theory with fractional D-branes preserving
N=1 supersymmetry and study the flux-induced fermionic mass terms both on
space-filling branes and on instantonic ones. Our results show the existence of
a relation between the soft supersymmetry breaking and the lifting of some
instanton fermionic zero-modes, which may lead to new types of non-perturbative
couplings in brane-world models. | | Source: | arXiv, 0807.1666 | | Services: | Forum | Review | PDF | Favorites | |
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