Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-th
Date Mardi 20 Juin 2017
Heure 11:00
Institut LPTENS
Salle LPTENS Library
Nom de l'orateur Nitti
Prenom de l'orateur Francesco
Addresse email de l'orateur
Institution de l'orateur APC Paris
Titre Holographic self-tuning of the cosmological constant
Résumé I will present a brane-world framework, based on the gauge/gravity duality, in which the four-dimensional cosmological constant is neutralized by a dynamical self-adjustment mechanism. The model consists in a five-dimensional Einstein-Dilaton gravity coupled to a four-dimensional brane on which ordinary matter and gauge fields are localized. The brane position in the bulk is determined dynamically by the junction conditions, and flat-brane solutions exist for generic values of the brane vacuum energy. A regime with emergent 4-dimensional gravity is possible, due to the presence of an induced gravity term on the brane. The emergent 4d graviton acquires an effective mass, and a five-dimensional regime may exist at large and/or small scales. Analysis of scalar fluctuations allows to formulate conditions for perturbative stability of the flat solutions, which can be met in a broad range of the model parameters.
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