Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series STR-LPT-ENS-HE
Subjects hep-th
Date Tuesday 20 June 2017
Time 11:00
Institute LPTENS
Seminar Room LPTENS Library
Speaker's Last Name Nitti
Speaker's First Name Francesco
Speaker's Email Address
Speaker's Institution APC Paris
Title Holographic self-tuning of the cosmological constant
Abstract 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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