Statut  Confirmé 
Série  APCTH 
Domaines  hepth 
Date  Mardi 16 Octobre 2018 
Heure  14:00 
Institut  APC 
Salle  646 A  Mondrian 
Nom de l'orateur  Ramirez 
Prenom de l'orateur  Hector 
Addresse email de l'orateur  
Institution de l'orateur  University of Valencia 
Titre  Inflation beyond GR 
Résumé  Scalartensor theories of gravity have become a very rich framework from which one can construct viable phenomenological models of early and latetime cosmology. In particular for inflation, previous models constructed using the Horndeski Lagrangian give predictions which are now in tension with CMB data. On the other hand, by trying to fit the observations, one would find instabilities at the level of the quantum perturbations. Furthermore, computing the standard inflationary observables in a semianalytical way is a nontrivial task. In this talk, first I will introduce a novel scalarvectortensor framework (SVT) from which Horndeski is a subclass theory. I will show a simple inflationary model using the SVT Lagrangian and, then, using the standard Ginflation parametrization, a new mechanism to avoid instabilities with a phenomenological model which fits CMB predictions, this by computing observables using the Generalized and Optimized SlowRoll techniques. 
Numéro de preprint arXiv  
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