13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

Non-local gravity and comparison with observational datasets

14 Dec 2015, 17:29
Level 2, Room 14 (International Conference Centre Geneva)

Level 2, Room 14

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


Yves Dirian (University of Geneva)


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.

Primary author

Yves Dirian (University of Geneva)


Martin Kunz (Universite de Geneve (CH)) Michele Maggiore (Universite de Geneve (CH)) Stefano Foffa (Universite de Geneve (CH)) Valeria Pettorino (U)

Presentation Materials