Speaker
Yves Dirian
(University of Geneva)
Description
We study the cosmological predictions of two recently proposed non-local modifications of General Relativity. Both models have the same number of parameters as $\Lambda$CDM, with a mass parameter $m$ replacing the cosmological constant. We implement the cosmological perturbations of the non-local models into a modification of the CLASS Boltzmann code, and we make a full comparison to CMB, BAO and supernova data. We find that the non-local models fit these datasets very well, at the same level as $\Lambda$CDM.
For both non-local models parameter estimation using Planck+JLA+BAO data gives a value of $H_0$ slightly higher than in $\Lambda$CDM.
Author
Yves Dirian
(University of Geneva)
Co-authors
Martin Kunz
(Universite de Geneve (CH))
Michele Maggiore
(Universite de Geneve (CH))
Stefano Foffa
(Universite de Geneve (CH))
Valeria Pettorino
(U)
