The magni cent seven and friends: Horndeski theories self-tuning to de Sitter.

Orador/Speaker: Prado Martn-Moruno (Universidad Complutense de Madrid, Spain)

Data, hora e local: 15 de março de 2016, às 11h30m na sala de reuniões do Departamento de Matemática.

Resumo/Abstract: I consider a dynamical adjustment mechanism able to screen any value of the cosmological constant. I will present the Horndeski models able to carry out that adjustment mechanism under the assumption that the gravity’s vacuum is described by a de Sitter geometry. Those models have a de Sitter critical point for any type of material content and are, therefore, of phenomenological inter-est. The cosmological consequences of the resulting models will be summarized, emphasizing the case with symmetry under shift rede nitions of the eld.

FCT_V_positivo

Funded by the Portuguese Government through the FCT – Fundação para a Ciência e a Tecnologia under the project UID/MAT/00212/2013

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