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S-duality Action on Discrete T-duality Invariants
Shamik Banerjee, Ashoke Sen
In heterotic string theory compactified on T^6, the T-duality orbits of dyons of charge (Q,P) are characterized by O(6,22;R) invariants Q^2, P^2 and Q.P together with a set of inva…
Linear b-Gauges for Open String Fields
Michael Kiermaier, Ashoke Sen, Barton Zwiebach
Motivated by Schnabl's gauge choice, we explore open string perturbation theory in gauges where a linear combination of antighost oscillators annihilates the string field. We find…
Duality Orbits, Dyon Spectrum and Gauge Theory Limit of Heterotic String Theory on T^6
Shamik Banerjee, Ashoke Sen
For heterotic string theory compactified on T^6, we derive the complete set of T-duality invariants which characterize a pair of charge vectors (Q,P) labelling the electric and mag…
Consistent Truncation to Three Dimensional (Super-)gravity
Rajesh Kumar Gupta, Ashoke Sen
For a general three dimensional theory of (super-)gravity coupled to arbitrary matter fields with arbitrary set of higher derivative terms in the effective action, we give an algor…
Three String Junction and N=4 Dyon Spectrum
Ashoke Sen
The exact spectrum of dyons in a class of N=4 supersymmetric string theories gives us information about dyon spectrum in N=4 supersymmetric gauge theories. This in turn can be tran…
Black Hole Entropy Function, Attractors and Precision Counting of Microstates
Ashoke Sen
In these lecture notes we describe recent progress in our understanding of attractor mechanism and entropy of extremal black holes based on the entropy function formalism. We also…