Ashoke Sen, of the Harish-Chandra Research Institute in Allahabad, India, is a pioneering string theorist whose many contributions include the famous Sen Conjecture, about open string tachyon condensation on unstable D-branes, as well as numerous insights about string dualities and entropy in black holes. 
Past PI Talks:
A list of talks by Prof. Sen can be found here.
Talks by Ashoke Sen
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D-barnes in noncritical strings and N=1 super Yang-MillsAshoke Sen Harish-Chandra Research Institute 
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Ashoke Sen (Harish Chandra Research Institute)Ashoke Sen Harish-Chandra Research Institute PIRSA:05070083
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Ashoke Sen (Harish Chandra Research Institute)Ashoke Sen Harish-Chandra Research Institute PIRSA:05070080
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Black hole microstate counting and its macroscopic counterpart IIIAshoke Sen Harish-Chandra Research Institute 
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Black hole microstate counting and its macroscopic counterpart IIAshoke Sen Harish-Chandra Research Institute 
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Black hole microstate counting and its macroscopic counterpart IAshoke Sen Harish-Chandra Research Institute 
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1PI Effective Action for Superstring Perturbation TheoryAshoke Sen Harish-Chandra Research Institute 
 
     
            