Cargando…

f(R) gravity modifications: from the action to the data

It is a very well established matter nowadays that many modified gravity models can offer a sound alternative to General Relativity for the description of the accelerated expansion of the universe. But it is also equally well known that no clear and sharp discrimination between any alternative theor...

Descripción completa

Detalles Bibliográficos
Autores principales: Lazkoz, Ruth, Ortiz-Baños, María, Salzano, Vincenzo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5849749/
https://www.ncbi.nlm.nih.gov/pubmed/29576741
http://dx.doi.org/10.1140/epjc/s10052-018-5711-6
_version_ 1783306095526150144
author Lazkoz, Ruth
Ortiz-Baños, María
Salzano, Vincenzo
author_facet Lazkoz, Ruth
Ortiz-Baños, María
Salzano, Vincenzo
author_sort Lazkoz, Ruth
collection PubMed
description It is a very well established matter nowadays that many modified gravity models can offer a sound alternative to General Relativity for the description of the accelerated expansion of the universe. But it is also equally well known that no clear and sharp discrimination between any alternative theory and the classical one has been found so far. In this work, we attempt at formulating a different approach starting from the general class of f(R) theories as test probes: we try to reformulate f(R) Lagrangian terms as explicit functions of the redshift, i.e., as f(z). In this context, the f(R) setting to the consensus cosmological model, the [Formula: see text] CDM model, can be written as a polynomial including just a constant and a third-order term. Starting from this result, we propose various different polynomial parameterizations f(z), including new terms which would allow for deviations from [Formula: see text] CDM, and we thoroughly compare them with observational data. While on the one hand we have found no statistically preference for our proposals (even if some of them are as good as [Formula: see text] CDM by using Bayesian Evidence comparison), we think that our novel approach could provide a different perspective for the development of new and observationally reliable alternative models of gravity.
format Online
Article
Text
id pubmed-5849749
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher Springer Berlin Heidelberg
record_format MEDLINE/PubMed
spelling pubmed-58497492018-03-21 f(R) gravity modifications: from the action to the data Lazkoz, Ruth Ortiz-Baños, María Salzano, Vincenzo Eur Phys J C Part Fields Regular Article - Theoretical Physics It is a very well established matter nowadays that many modified gravity models can offer a sound alternative to General Relativity for the description of the accelerated expansion of the universe. But it is also equally well known that no clear and sharp discrimination between any alternative theory and the classical one has been found so far. In this work, we attempt at formulating a different approach starting from the general class of f(R) theories as test probes: we try to reformulate f(R) Lagrangian terms as explicit functions of the redshift, i.e., as f(z). In this context, the f(R) setting to the consensus cosmological model, the [Formula: see text] CDM model, can be written as a polynomial including just a constant and a third-order term. Starting from this result, we propose various different polynomial parameterizations f(z), including new terms which would allow for deviations from [Formula: see text] CDM, and we thoroughly compare them with observational data. While on the one hand we have found no statistically preference for our proposals (even if some of them are as good as [Formula: see text] CDM by using Bayesian Evidence comparison), we think that our novel approach could provide a different perspective for the development of new and observationally reliable alternative models of gravity. Springer Berlin Heidelberg 2018-03-13 2018 /pmc/articles/PMC5849749/ /pubmed/29576741 http://dx.doi.org/10.1140/epjc/s10052-018-5711-6 Text en © The Author(s) 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3
spellingShingle Regular Article - Theoretical Physics
Lazkoz, Ruth
Ortiz-Baños, María
Salzano, Vincenzo
f(R) gravity modifications: from the action to the data
title f(R) gravity modifications: from the action to the data
title_full f(R) gravity modifications: from the action to the data
title_fullStr f(R) gravity modifications: from the action to the data
title_full_unstemmed f(R) gravity modifications: from the action to the data
title_short f(R) gravity modifications: from the action to the data
title_sort f(r) gravity modifications: from the action to the data
topic Regular Article - Theoretical Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5849749/
https://www.ncbi.nlm.nih.gov/pubmed/29576741
http://dx.doi.org/10.1140/epjc/s10052-018-5711-6
work_keys_str_mv AT lazkozruth frgravitymodificationsfromtheactiontothedata
AT ortizbanosmaria frgravitymodificationsfromtheactiontothedata
AT salzanovincenzo frgravitymodificationsfromtheactiontothedata