De Sitter spacetimes from warped compactifications of IIB string theory

Abstract

We continue our study of codimension two solutions of warped spacetime varying compactifications of string theory. In this Letter we discuss a non-supersymmetric solution of the classical type IIB string theory with de Sitter gravity on a codimension two uncompactified part of spacetime. A non-zero positive value of the cosmological constant is induced by the presence of non-trivial stringy moduli, such as the axion–dilaton system for the type IIB string theory. Furthermore, the naked singularity of the codimension two solution is resolved by the presence of a small but non-zero cosmological constant.