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

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, <in...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	David Benisty, Gonzalo J. Olmo, Diego Rubiera-Garcia
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	metric-affine gravity non-singular cosmologies born-infeld gravity observational constraints scalar fields Mathematics QA1-939
Acceso en línea:	https://doaj.org/article/b042371c837b48ed93ca04533d26ddc0
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:b042371c837b48ed93ca04533d26ddc0
record_format	dspace
spelling	oai:doaj.org-article:b042371c837b48ed93ca04533d26ddc02021-11-25T19:06:48ZSingularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter10.3390/sym131121082073-8994https://doaj.org/article/b042371c837b48ed93ca04533d26ddc02021-11-01T00:00:00Zhttps://www.mdpi.com/2073-8994/13/11/2108https://doaj.org/toc/2073-8994The 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, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ϵ</mi></semantics></math></inline-formula>) 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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>\|</mo><mi>ϵ</mi><mo>\|</mo></mrow><mo>≲</mo><mn>5</mn><mo>·</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>8</mn></mrow></msup><mspace width="4.pt"></mspace><msup><mi mathvariant="normal">m</mi><mn>2</mn></msup></mrow></semantics></math></inline-formula> 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.David BenistyGonzalo J. OlmoDiego Rubiera-GarciaMDPI AGarticlemetric-affine gravitynon-singular cosmologiesborn-infeld gravityobservational constraintsscalar fieldsMathematicsQA1-939ENSymmetry, Vol 13, Iss 2108, p 2108 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	metric-affine gravity non-singular cosmologies born-infeld gravity observational constraints scalar fields Mathematics QA1-939
spellingShingle	metric-affine gravity non-singular cosmologies born-infeld gravity observational constraints scalar fields Mathematics QA1-939 David Benisty Gonzalo J. Olmo Diego Rubiera-Garcia Singularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter
description	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, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ϵ</mi></semantics></math></inline-formula>) 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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mrow><mo>\|</mo><mi>ϵ</mi><mo>\|</mo></mrow><mo>≲</mo><mn>5</mn><mo>·</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>8</mn></mrow></msup><mspace width="4.pt"></mspace><msup><mi mathvariant="normal">m</mi><mn>2</mn></msup></mrow></semantics></math></inline-formula> 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.
format	article
author	David Benisty Gonzalo J. Olmo Diego Rubiera-Garcia
author_facet	David Benisty Gonzalo J. Olmo Diego Rubiera-Garcia
author_sort	David Benisty
title	Singularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter
title_short	Singularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter
title_full	Singularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter
title_fullStr	Singularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter
title_full_unstemmed	Singularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter
title_sort	singularity-free and cosmologically viable born-infeld gravity with scalar matter
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b042371c837b48ed93ca04533d26ddc0
work_keys_str_mv	AT davidbenisty singularityfreeandcosmologicallyviableborninfeldgravitywithscalarmatter AT gonzalojolmo singularityfreeandcosmologicallyviableborninfeldgravitywithscalarmatter AT diegorubieragarcia singularityfreeandcosmologicallyviableborninfeldgravitywithscalarmatter
_version_	1718410300152086528

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

Ejemplares similares