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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…
Rare Decay Modes of Quarter BPS Dyons
Ashoke Sen
The degeneracy of quarter BPS dyons in N=4 supersymmetric string theories is known to jump across walls of marginal stability on which a quarter BPS dyon can decay into a pair of h…
AdS_3, Black Holes and Higher Derivative Corrections
Justin R. David, Bindusar Sahoo, Ashoke Sen
Using AdS/CFT correspondence and the Euclidean action formalism for black hole entropy Kraus and Larsen have argued that the entropy of a BTZ black hole in three dimensional superg…
Adding Charges to N=4 Dyons
Nabamita Banerjee, Dileep P. Jatkar, Ashoke Sen
The spectrum of dyons in a class of N=4 supersymmetric string theories has been found for a specific set of electric and magnetic charge vectors. We extend the analysis to more gen…
Two Centered Black Holes and N=4 Dyon Spectrum
Ashoke Sen
The exact spectrum of dyons in a class of N=4 supersymmetric string theories is known to change discontinuously across walls of marginal stability. We show that the change in the d…
Geometric Tachyon to Universal Open String Tachyon
Ashoke Sen
A system of k Neveu-Schwarz (NS) 5-branes of type II string theory with one transverse direction compactified on a circle admits various unstable D-brane systems, - some with geome…
Walls of Marginal Stability and Dyon Spectrum in N=4 Supersymmetric String Theories
Ashoke Sen
The spectrum of quarter BPS dyons in N=4 supersymmetric string theories can change as the asymptotic moduli cross walls of marginal stability on which the dyon can break apart into…