New de Sitter solutions of 10d type IIB supergravity

TL;DR

This paper discovers 17 new de Sitter solutions in 10d type IIB supergravity with intersecting branes and orientifolds, analyzes their stability, and assesses their potential as classical string backgrounds.

Contribution

It introduces a set of 17 new de Sitter solutions in 10d type IIB supergravity, including a Minkowski solution, and evaluates their stability and string-theoretic viability.

Findings

All de Sitter solutions are perturbatively unstable.

Four solutions are compact on 6d group manifolds.

Several solutions are promising as classical string backgrounds.

Abstract

We find and study 17 new de Sitter solutions of ten-dimensional (10d) type IIB supergravity with intersecting D5-branes and orientifold O5-planes, as well as a new Minkowski one. These solutions are obtained numerically on 6d group manifolds, the compactness of which is established for 4 of them. We show that all our de Sitter solutions are perturbatively unstable, using a restricted 4d effective theory of four scalar fields. We finally analyse whether our solutions can be promoted to classical string backgrounds. Several of them appear as good candidates, as they satisfy all requirements imposed so far.