Trapped quintessential inflation
Abstract
Quintessential inflation is studied using a string modulus as the inflatonquintessence field. The modulus begins its evolution at the steep part of its scalar potential, which is due to nonperturbative effects (e.g. gaugino condensation). It is assumed that the modulus crosses an enhanced symmetry point (ESP) in field space. Particle production at the ESP temporarily traps the modulus resulting in a brief period of inflation. More inflation follows, due to the flatness of the potential, since the ESP generates either an extremum (maximum or minimum) or a flat inflection point in the scalar potential. Eventually, the potential becomes steep again and inflation is terminated. After reheating the modulus freezes due to cosmological friction at a large value, such that its scalar potential is dominated by contributions due to fluxes in the extra dimensions or other effects. The modulus remains frozen until the present, when it can become quintessence and account for the dark energy necessary to explain the observed accelerated expansion.
 Publication:

Physics Letters B
 Pub Date:
 November 2006
 DOI:
 10.1016/j.physletb.2006.09.045
 arXiv:
 arXiv:hepth/0605258
 Bibcode:
 2006PhLB..642..294B
 Keywords:

 High Energy Physics  Theory
 EPrint:
 12 pages, 1 figure