(A)dS Backgrounds from Asymmetric Orientifolds

Details (A)dS Backgrounds from Asymmetric Orientifolds (A)dS Backgrounds from Asymmetric Orientifolds

2001-06-22

arxiv.org/abs/hep-th/0106209v1

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, harvmac big, contribution to Strings 2001

Scientific paper

I present asymmetric orientifold models which, with the addition of RR fluxes, fix all the NS NS moduli including the dilaton. In critical string theory, this gives new AdS backgrounds with (discretely tunably) weak string coupling. Extrapolating to super-critical string theory, this construction leads to a promising candidate for a metastable de Sitter background with string coupling of order 1/10 and dS radius of order 100 times the string scale. Extrapolating further to larger and larger super-critical dimension suggests the possibility of finding de Sitter backgrounds with weaker and weaker string coupling. This note is an updated version of the last part of my Strings 2001 talk.

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