Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-11-05
JHEP 0203 (2002) 052
Physics
High Energy Physics
High Energy Physics - Theory
30 pages, 2 figures. Substantial changes on version 1. New cosmological scenarios proposed including the dilaton as the inflat
Scientific paper
10.1088/1126-6708/2002/03/052
We analyse the cosmological implications of brane-antibrane systems in string-theoretic orbifold and orientifold models. In a class of realistic models, consistency conditions require branes and antibranes to be stuck at different fixed points, and so their mutual attraction generates a potential for one of the radii of the underlying torus or the 4D string dilaton. Assuming that all other moduli have been fixed by string effects, we find that this potential leads naturally to a period of cosmic inflation with the radion or dilaton field as the inflaton. The slow-roll conditions are satisfied more generically than if the branes were free to move within the space. The appearance of tachyon fields at certain points in moduli space indicates the onset of phase transitions to different non-BPS brane systems, providing ways of ending inflation and reheating the corresponding observable brane universe. In each case we find relations between the inflationary parameters and the string scale to get the correct spectrum of density perturbations. In some examples the small numbers required as inputs are no smaller than 0.01, and are the same small quantities which are required to explain the gauge hierarchy.
Burgess Cliff P.
Martineau Patrick
Quevedo Fernando
Rajesh Govindan
Zhang Ren-Jie
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