Work

Stability issues of nonlocal gravity during primordial inflation

Year: 2018

Type: article

Abstract: We study the cosmological evolution of some nonlocal gravity models, when the initial conditions are set during a phase of primordial inflation. We examine in particular three models, the so-called RT, RR and [Formula: see text] models, previously introduced by our group. We find that, during inflation, the RT model has a viable background evolution, but at the level of cosmological perturbations develops instabilities that make it nonviable. In contrast, the RR and [Formula: see text] models have a viable evolution even when their initial conditions are set during a phase of primordial inflation.

Source: International Journal of Modern Physics A

DOI: 10.1142/s0217751x18500070

Authors: Enis Belgacem, Giulia Cusin, Stefano Foffa, Michele Maggiore, Michele Mancarella

Institutions: University of Geneva, Université Paris-Sud, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Institut de Physique Théorique

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Centres of Competence in Research SwissMAP, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

OpenAlex ID: W2770838985

FWCI: 0.61

Cites: 49

Cited by: 7

Related to: 10