RT Journal Article
T1 Singularity-free and cosmologically viable Born-Infeld gravity with scalar matter
A1 Benisty, David
A1 Olmo, Gonzalo J.
A1 Rubiera García, Diego
AB The 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, epsilon) 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 |epsilon|& LSIM;5 & BULL;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.
PB MDPI
SN 2073-8994
YR 2021
FD 2021-11
LK https://hdl.handle.net/20.500.14352/4607
UL https://hdl.handle.net/20.500.14352/4607
LA eng
NO © 2021 by the authors.D.B. gratefully acknowledges the support from the Blavatnik and the Rothschild fellowship. G.J.O. is no longer funded by the Ramon y Cajal contract RYC-2013-13019 (Spain) because he became permanent. D.R.-G. is funded by the Atraccion de Talento Investigador programme of the Comunidad de Madrid (Spain) No. 2018-T1/TIC-10431, and acknowledges further support from the Ministerio de Ciencia, Innovacion y Universidades (Spain) project No. PID2019-108485GB-I00/AEI/10.13039/501100011033, and the FCT projects No. PTDC/FIS-PAR/31938/2017 and PTDC/FIS-OUT/29048/2017. This work is supported by the Spanish Grant FIS2017-84440-C21-P funded by MCIN/AEI/10.13039/501100011033 "ERDF Away of making Europe", Grant PID2020-116567GB-C21 funded by MCIN/AEI/10.13039/501100011033, the project PROMETEO/2020/079 (Generalitat Valenciana), the project i-COOPB20462 (CSIC) and the Edital 006/2018 PRONEX (FAPESQ-PB/CNPQ, Brazil, Grant 0015/2019). This article is based on work from COST Action CA18108, supported by COST (European Cooperation in Science and Technology).
NO Unión Europea. H2020
NO Ministerio de Economía y Competitividad (MINECO)/FEDER
NO Ministerio de Economía y Competitividad (MINECO)/AEI
NO Ministerio de Ciencia e Innovación (MICINN)
NO Comunidad de Madrid
NO Generalitat Valenciana  European Commission  General Electric
NO Consejo Superior de Investigaciones Científicas (CSIC)
NO Fundação para a Ciência e a Tecnologia (FCT)
NO FAPESQ-PB/CNPQ
DS Docta Complutense
RD 28 abr 2024