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Singularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter

Published version
Peer-reviewed

Change log

Authors

Olmo, Gonzalo J 
Rubiera-Garcia, Diego 

Abstract

jats:pThe early cosmology, driven by a single scalar field, both massless and massive, in the context of Eddington-inspired Born-Infeld gravity, is explored. We show the existence of nonsingular solutions of bouncing and loitering type (depending on the sign of the gravitational theory’s parameter, ϵ) replacing the Big Bang singularity, and discuss their properties. In addition, in the massive case, we find some new features of the cosmological evolution depending on the value of the mass parameter, including asymmetries in the expansion/contraction phases, or a continuous transition between a contracting phase to an expanding one via an intermediate loitering phase. We also provide a combined analysis of cosmic chronometers, standard candles, BAO, and CMB data to constrain the model, finding that for roughly |ϵ|≲5·10−8m2 the model is compatible with the latest observations while successfully removing the Big Bang singularity. This bound is several orders of magnitude stronger than the most stringent constraints currently available in the literature.</jats:p>

Description

Keywords

metric-affine gravity, non-singular cosmologies, born-infeld gravity, observational constraints, scalar fields

Journal Title

SYMMETRY-BASEL

Conference Name

Journal ISSN

2073-8994
2073-8994

Volume Title

13

Publisher

MDPI AG
Sponsorship
Consejería de Educación e Investigación (No. 2018-T1/TIC-10431)
Ministerio de Ciencia, Innovación y Universidades (PID2019-108485GB-I00/AEI/10.13039/501100011033)
Fundação para a Ciência e a Tecnologia (PTDC/FIS-PAR/31938/2017, PTDC/FIS-OUT/29048/2017)
Ministerio de Economía, Industria y Competitividad, Gobierno de España (FIS2017-84440-C2-1-P)
Generalitat Valenciana (PROMETEO/2020/079)
Consejo Superior de Investigaciones Científicas (i-COOPB20462)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (PRONEX)
European Cooperation in Science and Technology (CA18108)