Talk by Marialuisa Frau – Niels Bohr Institute - University of Copenhagen

Niels Bohr Institute > Calendar > 2011 > Talk by Marialuisa Frau

Talk by Marialuisa Frau

Marialuisa Frau (University of Torino)

Holographic non-perturbative corrections to gauge couplings

We give a direct microscopic derivation of the exact F-theory solution for the axion-dilaton field emitted by D7 branes in type I' theory. The couplings of the axion-dilaton field to the D-instanton moduli modify its  source terms, classically given by delta-functions located at the D7 and O7 positions and the modified source terms are shown to be proportional to the instanton-corrected elements of the D7-brane ``chiral ring''. Solving the bulk equation of motion with the non-perturbatively corrected source terms yields the exact background solution which represents the gravitational dual of the 4-dimensional theory living on a D3 probe, namely of the Sp(1) N=2 SYM theory with four flavours.