Résumé / Abstract Seminaire_GReCO
SÉMINAIRE DU GRECO

"Classical de Sitter string backgrounds"

David Andriot
Max-Planck-Institut für Gravitationsphysik (Albert Einstein Institut) (Potsdam-Golm, Allemagne)

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.

lundi 9 octobre 2017 - 11:00
Salle des séminaires Évry Schatzman,
Institut d'Astrophysique de Paris

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