Seminar series
Date
Tue, 19 Jul 2016
Time
12:00 -
13:15
Location
L5
Speaker
Dr Olaf Hohm
Organisation
Stonybrook
I review work done in collaboration with Siegel and Zwiebach, in which a doubled geometry is developed that provides a spacetime action containing the standard gravity theory for graviton, Kalb-Ramond field and dilaton plus higher-derivative corrections. In this framework the T-duality O(d,d) invariance is manifest and exact to all orders in $\alpha'$. This theory by itself does not correspond to a standard string theory, but it does encode the Green-Schwarz deformation characteristic of heterotic string theory to first order in $\alpha'$ and a Riemann-cube correction to second order in $\alpha'$. I outline how this theory may be extended to include arbitrary string theories.