Status | Confirmed |
Seminar Series | SEM-GRECO |
Subjects | hep-th |
Date | Monday 9 October 2017 |
Time | 11:00 |
Institute | IAP |
Seminar Room | Salle des séminaires |
Speaker's Last Name | Andriot |
Speaker's First Name | David |
Speaker's Email Address | |
Speaker's Institution | CERN |
Title | Classical de Sitter string backgrounds |
Abstract | Realising cosmological models in string theory, by for instance embedding inflation models in a string compactification, typically requires to have a metastable de Sitter background. The latter would correspond to e.g. the vacuum at the end of inflation. Here we focus on classical backgrounds: those only contain well-controlled ingredients to realise the embedding as a compactification. Such de Sitter solutions are very difficult to obtain, and there exists so far no metastable example. We study this problem and as a first step, we derive new constraints on the existence of classical de Sitter solutions, considering various configurations of D-branes and orientifolds. While some configurations completely forbid having de Sitter solutions, others still allow for it in small regions of the parameter space that we identify. |
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