Rolling Tachyon
Abstract
We discuss construction of classical time dependent solutions in open string (field) theory, describing the motion of the tachyon on unstable Dbranes. Despite the fact that the string field theory action contains infinite number of time derivatives, and hence it is not a priori clear how to set up the initial value problem, the theory contains a family of time dependent solutions characterized by the initial position and velocity of the tachyon field. We write down the worldsheet action of the boundary conformal field theories associated with these solutions and study the corresponding boundary states. For Dbranes in bosonic string theory, the energy momentum tensor of the system evolves asymptotically towards a finite limit if we push the tachyon in the direction in which the potential has a local minimum, but hits a singularity if we push it in the direction where the potential is unbounded from below.
 Publication:

Journal of High Energy Physics
 Pub Date:
 April 2002
 DOI:
 10.1088/11266708/2002/04/048
 arXiv:
 arXiv:hepth/0203211
 Bibcode:
 2002JHEP...04..048S
 Keywords:

 High Energy Physics  Theory;
 Astrophysics;
 General Relativity and Quantum Cosmology
 EPrint:
 LaTeX file, 20 pages, references added