September 11, 2017 to October 6, 2017
Institut de Physique Théorique, CEA Saclay
Europe/Paris timezone
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Bartolo: "Large Scale Structure in mimetic Horndeski gravity"

Sep 27, 2017, 9:30 AM
Institut de Physique Théorique, CEA Saclay

Institut de Physique Théorique, CEA Saclay

Orme des Merisiers batiment 774 Point courrier 136 CEA/DSM/IPhT, CEA/Saclay F-91191 Gif-sur-Yvette Cedex FRANCE


Within the so called mimetic gravity I will discuss cosmological perturbations for mimetic Horndeski models. I will focus on a proposal for a  model of the dark universe, where both cold dark matter (CDM) and dark energy phenomena are described by a single component, the mimetic field.   For the simpler minimal model it turns out that if the background expansion history is chosen to be  identical to a perfect fluid dark energy (PFDE), then the mimetic model predicts the same power spectrum for the gravitational potentials as the PFDE. I will also discuss the distinguishability between these mimetic models and other popular models for DE. Finally I will present some preliminary results about the  extraction of some parameters commonly used to quantify modifications w.r.t. to standard GR, like for example modifications of the Poisson equation.

Presentation materials