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dc.contributor.authorBenisty, David
dc.contributor.authorOlmo, Gonzalo J
dc.contributor.authorRubiera-Garcia, Diego
dc.date.accessioned2021-11-08T00:20:08Z
dc.date.available2021-11-08T00:20:08Z
dc.date.issued2021
dc.identifier.issn2073-8994
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/330414
dc.description.abstract<jats:p>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, 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>
dc.languageen
dc.publisherMDPI AG
dc.subjectmetric-affine gravity
dc.subjectnon-singular cosmologies
dc.subjectborn-infeld gravity
dc.subjectobservational constraints
dc.subjectscalar fields
dc.titleSingularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter
dc.typeArticle
dc.date.updated2021-11-08T00:20:07Z
prism.issueIdentifier11
prism.publicationNameSYMMETRY-BASEL
prism.volume13
dc.identifier.doi10.17863/CAM.77857
dcterms.dateAccepted2021-10-29
rioxxterms.versionofrecord10.3390/sym13112108
rioxxterms.versionVoR
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidBenisty, David [0000-0002-9578-3081]
dc.identifier.eissn2073-8994
pubs.funder-project-idConsejería de Educación e Investigación (No. 2018-T1/TIC-10431)
pubs.funder-project-idMinisterio de Ciencia, Innovación y Universidades (PID2019-108485GB-I00/AEI/10.13039/501100011033)
pubs.funder-project-idFundação para a Ciência e a Tecnologia (PTDC/FIS-PAR/31938/2017, PTDC/FIS-OUT/29048/2017)
pubs.funder-project-idMinisterio de Economía, Industria y Competitividad, Gobierno de España (FIS2017-84440-C2-1-P)
pubs.funder-project-idGeneralitat Valenciana (PROMETEO/2020/079)
pubs.funder-project-idConsejo Superior de Investigaciones Científicas (i-COOPB20462)
pubs.funder-project-idConselho Nacional de Desenvolvimento Científico e Tecnológico (PRONEX)
pubs.funder-project-idEuropean Cooperation in Science and Technology (CA18108)
cam.issuedOnline2021-11-06


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