Ashoke Sen

  1. List of research papers written between April 2002 and March 2003

    1. A. Sen, ``Field theory of tachyon matter,'' Mod. Phys. Lett. A 17, 1797 (2002) [arXiv:hep-th/0204143].

    2. A. Sen, ``Time evolution in open string theory,'' JHEP 0210, 003 (2002) [arXiv:hep-th/0207105].

    3. P. Mukhopadhyay and A. Sen, ``Decay of unstable D-branes with electric field,'' JHEP 0211, 047 (2002) [arXiv:hep-th/0208142].

    4. A. Sen, ``Time and tachyon,'' to appear in Int. J. Mod. Phys. A [arXiv:hep-th/0209122].

    5. A. Sen, ``Dirac-Born-Infeld action on the tachyon kink and vortex,'' submitted for publication [arXiv:hep-th/0303057].

  2. Invited talk at conferences and workshops

    1. String Theory

      Plenary talk given at DPF2002, Williamsburg, USA, May 24-28, 2002.

    2. Tachyon Dynamics in Open String Theory, given at Strings 2003, Cambridge, July 15-20, 2002.

    3. Tachyons in String Theory, given at TH-2002, Paris, July 22-27, 2002.

    4. Tachyon Dynamics in String Theory, given at the 17th Nishinomiya-Yukawa Symposium, Nishinomiya, Nov. 12-13, 2002

    5. Effectiveness of Tachyon Effective action, given at the workshop at Kyoto University, Nov. 15-16, 2002

    6. Tachyon Dynamics in String Theory, given at PASCOS03, TIFR, Mumbai, January 3-8, 2003.

    7. Tachyons in String Theory, given at the `50 Years of the Department of Theoretical Physics Conference' at IACS, Kolkata, Jan. 21-24, 2003.

    8. Search for a Unified Theory, given at `New Frontiers in Physics', Presidency College, Kolkata, Feb. 21, 2003.

    9. Time and Tachyon, given at AKR-80, SNBCS and Jadavpur University, Kolkata, Feb. 22-24, 2003.

  3. Special Lectures, Visits;

    1. James H. Simons lectures, SUNY at Stony Brook, New York, USA, April 29 - May 10, 2002.

    2. Rothschild Visiting Professor, Isaac Newton Institute, Cambridge, U.K., June 21 - July 20, 2002

  4. Courses given at the institute

    1. Quantum Field Theory 1: Spring 2003


  5. Summary of research during April 2002 - March 2003

    My research during the period of April 2002 to March 2003 has been focussed primarily on the subject of time dependent solution involving the open string tachyon field. In hep-th/0204143 I showed that the qualitative features of such time dependent solutions in string theory can be explained with the help of a simple classical effective action for the tachyon field. In hep-th/0207105 I developed a general method for constructing time dependent solutions in open string theory involving multiple rolling tachyons. In hep-th/0208142 with Partha Mukhopadhyay I generalised the earlier stringy solutions involving time dependent tachyon field to include the effect of background electric field. In hep-th/0209122 I showed how the tachyon field could serve as a definition of time in quantum cosmology. In hep-th/0303057 I showed that the tachyon effective action which was used earlier to reproduce the time dependence of the rolling tachyon, can also be used to explain the construction of BPS D-branes as kink and vortex solutions in the world-volume theories on a non-BPS D-brane and a brane-antibrane system respectively.



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