Graceful Exit in String Cosmology

Ram Brustein, Richard Madden

Submitted on 18 November 1997


The graceful exit transition from a dilaton-driven inflationary phase to a decelerated Friedmann-Robertson-Walker era requires certain classical and quantum corrections to the string effective action. Classical corrections can stabilize a high curvature string phase while the evolution is still in the weakly coupled regime, and quantum corrections can induce violation of the null energy condition, allowing evolution towards a decelerated phase.


Comment: 6 pages, LateX. Contribution to the proceedings of the workshop Modern Modified Theories of Gravitation and Cosmology, 29-30 June, 1997, Ben-Gurion University, Beer-Sheva, Israel and the International Europhysics Conference on High-Energy Physics, 19-26 August, 1997, Jerusalem, Israel

Subjects: High Energy Physics - Theory; Astrophysics; General Relativity and Quantum Cosmology