2 papers
hep-th2003
Time-Dependent Warping, Fluxes, and NCYM
Keshav Dasgupta, Govindan Rajesh, Daniel Robbins +1
We describe the supergravity solutions dual to D6-branes with both time-dependent and time-independent B-fields. These backgrounds generalize the Taub-NUT metric in two key ways: t…
hep-th2002
Comments on Cosmological Singularities in String Theory
Micha Berkooz, Ben Craps, David Kutasov +1
We compute string scattering amplitudes in an orbifold of Minkowski space by a boost, and show how certain divergences in the four point function are associated with graviton excha…