de Sitter vacua in string theory
Abstract
We outline the construction of metastable de Sitter vacua of type IIB string theory. Our starting point is highly warped IIB compactifications with nontrivial NS and RR threeform fluxes. By incorporating known corrections to the superpotential from Euclidean Dbrane instantons or gaugino condensation, one can make models with all moduli fixed, yielding a supersymmetric AdS vacuum. Inclusion of a small number of D3̄branes in the resulting warped geometry allows one to uplift the AdS minimum and make it a metastable de Sitter ground state. The lifetime of our metastable de Sitter vacua is much greater than the cosmological time scale of 10^{10} yr. We also prove, under certain conditions, that the lifetime of dS space in string theory will always be shorter than the recurrence time.
 Publication:

Physical Review D
 Pub Date:
 August 2003
 DOI:
 10.1103/PhysRevD.68.046005
 arXiv:
 arXiv:hepth/0301240
 Bibcode:
 2003PhRvD..68d6005K
 Keywords:

 11.25.Yb;
 98.80.k;
 M theory;
 Cosmology;
 High Energy Physics  Theory;
 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 12 pages, 2 figs, added comments on the thin wall approximation to tunneling