Lifshitz-like systems and AdS null deformations (HoloCondmatTifr) --- talk at the Discussion Meeting on applied string theory (holographic condensed matter and QCD) around the Chandrasekhar lectures given by Dam Son at TIFR, Mumbai, Mar '11.
Cosmological singularities in string theory (cosmoHRI) --- talk at the "Primordial Features and Non-Gaussianities" international conference, HRI, Allahabad, Dec '10.
Lifshitz spacetimes from AdS null and cosmological solutions (Ascona) --- talk at the International Conference on String and M-theory, Ascona, Switzerland, Jul '10.
Nonsupersymmetric C4/ZN singularities and closed string tachyons (NSM09) --- talk at National Strings Meeting (NSM09), IIT Bombay, India.
Time-dependent Phenomena in String Theory (knTime07.pdf) --- colloquium style talk on aspects of cosmological singularities in AdS/CFT, and closed string tachyon condensation in certain classes of 3-dim unstable singularities (parts of this latter bit were also at the ISM04 talk, Khajuraho, India).
Cosmological Singularities, Gauge Theory Duals and Strings (knCosmoStr09.pdf) --- recent talk on aspects of cosmological singularities in AdS/CFT as well as worldsheet descriptions of some null singularities.
Some previous talks on cosmological singularities:
ISM 08 String theory workshop, '08, Pondicherry;
KITPC String Cosmology Workshop, '07, Beijing, China;
ICTP Cosmology Workshop, '07, Trieste, Italy (also at ISM 06, Puri, India).