Cosmological evolution of the rolling tachyon
Abstract
The cosmological effects of the tachyon rolling down to its ground state are discussed by coupling a simple effective field theory for the tachyon field to Einstein gravity. As the tachyon rolls down to the minimum of its potential the universe expands. Depending upon initial conditions, the scale factor may or may not start off accelerating, but ultimately it ceases to do so and the final flat spacetime is either static in the rest frame of the tachyon (if /k=0) or (if /k=1) given by the Milne model.
 Publication:

Physics Letters B
 Pub Date:
 June 2002
 DOI:
 10.1016/S03702693(02)018816
 arXiv:
 arXiv:hepth/0204008
 Bibcode:
 2002PhLB..537....1G
 Keywords:

 High Energy Physics  Theory
 EPrint:
 6 pages, no figures, typos corrected and two refs inserted