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Title: Non-local gravity and comparison with observational datasets

Abstract

We study the cosmological predictions of two recently proposed non-local modifications of General Relativity. Both models have the same number of parameters as ΛCDM, 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 ΛCDM. Among the vast literature on modified gravity models, this is, to our knowledge, the only example which fits data as well as ΛCDM without requiring any additional parameter. For both non-local models parameter estimation using Planck +JLA+BAO data gives a value of H{sub 0} slightly higher than in ΛCDM.

Authors:
; ; ;  [1];  [2]
  1. Département de Physique Théorique and Center for Astroparticle Physics, Université de Genève, 24 quai Ansermet, CH-1211 Genève 4 (Switzerland)
  2. Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120 Heidelberg (Germany)
Publication Date:
OSTI Identifier:
22525870
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; COMPARATIVE EVALUATIONS; COSMOLOGICAL CONSTANT; COSMOLOGICAL MODELS; DISTURBANCES; GENERAL RELATIVITY THEORY; GRAVITATION; MASS; MODIFICATIONS; NONLUMINOUS MATTER; OSCILLATIONS; SUPERNOVAE

Citation Formats

Dirian, Yves, Foffa, Stefano, Kunz, Martin, Maggiore, Michele, and Pettorino, Valeria, E-mail: Yves.Dirian@unige.ch, E-mail: stefano.foffa@unige.ch, E-mail: martin.kunz@unige.ch, E-mail: michele.maggiore@unige.ch, E-mail: v.pettorino@thphys.uni-heidelberg.de. Non-local gravity and comparison with observational datasets. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/04/044.
Dirian, Yves, Foffa, Stefano, Kunz, Martin, Maggiore, Michele, & Pettorino, Valeria, E-mail: Yves.Dirian@unige.ch, E-mail: stefano.foffa@unige.ch, E-mail: martin.kunz@unige.ch, E-mail: michele.maggiore@unige.ch, E-mail: v.pettorino@thphys.uni-heidelberg.de. Non-local gravity and comparison with observational datasets. United States. doi:10.1088/1475-7516/2015/04/044.
Dirian, Yves, Foffa, Stefano, Kunz, Martin, Maggiore, Michele, and Pettorino, Valeria, E-mail: Yves.Dirian@unige.ch, E-mail: stefano.foffa@unige.ch, E-mail: martin.kunz@unige.ch, E-mail: michele.maggiore@unige.ch, E-mail: v.pettorino@thphys.uni-heidelberg.de. Wed . "Non-local gravity and comparison with observational datasets". United States. doi:10.1088/1475-7516/2015/04/044.
@article{osti_22525870,
title = {Non-local gravity and comparison with observational datasets},
author = {Dirian, Yves and Foffa, Stefano and Kunz, Martin and Maggiore, Michele and Pettorino, Valeria, E-mail: Yves.Dirian@unige.ch, E-mail: stefano.foffa@unige.ch, E-mail: martin.kunz@unige.ch, E-mail: michele.maggiore@unige.ch, E-mail: v.pettorino@thphys.uni-heidelberg.de},
abstractNote = {We study the cosmological predictions of two recently proposed non-local modifications of General Relativity. Both models have the same number of parameters as ΛCDM, 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 ΛCDM. Among the vast literature on modified gravity models, this is, to our knowledge, the only example which fits data as well as ΛCDM without requiring any additional parameter. For both non-local models parameter estimation using Planck +JLA+BAO data gives a value of H{sub 0} slightly higher than in ΛCDM.},
doi = {10.1088/1475-7516/2015/04/044},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2015,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}