Status  Confirmed 
Seminar Series  APCTH 
Subjects  hepth 
Date  Tuesday 16 October 2018 
Time  14:00 
Institute  APC 
Seminar Room  646 A  Mondrian 
Speaker's Last Name  Ramirez 
Speaker's First Name  Hector 
Speaker's Email Address  
Speaker's Institution  University of Valencia 
Title  Inflation beyond GR 
Abstract  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. 
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