CAAUL Seminar - CMB observables and modifications of gravity - 31 março 2014

Carsten van de Bruck

Sheffield

Abstract / Resumo

Scalar tensor theories are simple extensions of General Relativity and studied in the context of dark energy and/or modified gravity theories. Given that fifth forces have not been detected, the force mediated by an additional scalar degree of freedom has to be either short-ranged or the (effective) coupling has to be very small (in the laboratory and solar system at least). Several screening mechanism have been suggested, such as the chameleon, the symmetron or the Damour-Nordvedt mechanism. More recently, more complicated models with both conformal and disformal couplings have been put forward. In this talk I will discuss in how far the properties of the CMB can test such modifications of gravity present either in the radiation dominated epoch or at late times. Both conformal and disformal couplings to matter and radiation will be discussed.

31 de março de 2014 | 11:00

Local

FCUL - Faculdade de Ciências da Universidade de Lisboa

Room C8.2.04 @ 11:00