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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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2018
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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 |
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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 |
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