Model-independent Reconstruction of f(T) Gravity from Gaussian Processes

We apply Gaussian processes and Hubble function data in f(T) cosmology to reconstruct for the first time the f(T) form in a model-independent way. In particular, using H(z) data sets coming from cosmic chronometers as well as from the method of radial baryon acoustic oscillations, alongside the late...

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Autores: Cai, Yifu, Khurshudyan, Martiros, Saridakis, Emmanuel
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2020
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/235483
Acceso en línea:http://hdl.handle.net/10261/235483
Access Level:acceso abierto
Palabra clave:Cosmological parameters
Gaussian process
Test of modified gravity
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spelling Model-independent Reconstruction of f(T) Gravity from Gaussian ProcessesCai, YifuKhurshudyan, MartirosSaridakis, EmmanuelCosmological parametersGaussian processTest of modified gravityWe apply Gaussian processes and Hubble function data in f(T) cosmology to reconstruct for the first time the f(T) form in a model-independent way. In particular, using H(z) data sets coming from cosmic chronometers as well as from the method of radial baryon acoustic oscillations, alongside the latest released local value of H = 73.52 1.62 km s Mpc, we reconstruct H(z) and its derivatives, resulting eventually in a reconstructed region for f(T), without any assumption. Although the cosmological constant lies in the central part of the reconstructed region, the obtained mean curve follows a quadratic function. Inspired by this we propose a new f(T) parameterization, i.e., f(T) =-2Λ + ξT , with ξ the sole free parameter that quantifies the deviation from ΛCDM cosmology. Additionally, we confront three viable one-parameter f(T) models from the literature, which are the power-law, the square-root exponential, and the exponential models, with the reconstructed f(T) region, and then we extract significantly improved constraints for their model parameters, comparing to the constraints that arise from the usual observational analysis. Finally, we argue that since we are using the direct Hubble measurements and the local value for H in our analysis, the H tension can be efficiently alleviated with the above reconstruction of f(T).YFC is supported in part by the National Youth Thousand Talents Program of China, by NSFC (Nos. 11722327, 11653002, 11961131007, 11421303), by CAST (2016QNRC001), and by the Fundamental Research Funds for Central Universities. MK is supported in part by a CAS President’s International Fellowship Initiative Grant (No. 2018PM0054) and by NSFC (No. 11847226). ENS is supported partly by USTC fellowship for international visiting professors. This article is partially based upon work from COST Action “Cosmology and Astrophysics Network for Theoretical Advances and Training Actions”, supported by COST (European Cooperation in Science and Technology). All numerics were operated on the computer clusters Linda & Judy in the particle cosmology group at USTC.IOP PublishingNational Natural Science Foundation of ChinaEuropean CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2021202120202021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Preprintinfo:eu-repo/semantics/submittedVersionhttp://hdl.handle.net/10261/235483reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://doi.org/10.3847/1538-4357/ab5a7fSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2354832026-05-22T06:33:51Z
dc.title.none.fl_str_mv Model-independent Reconstruction of f(T) Gravity from Gaussian Processes
title Model-independent Reconstruction of f(T) Gravity from Gaussian Processes
spellingShingle Model-independent Reconstruction of f(T) Gravity from Gaussian Processes
Cai, Yifu
Cosmological parameters
Gaussian process
Test of modified gravity
title_short Model-independent Reconstruction of f(T) Gravity from Gaussian Processes
title_full Model-independent Reconstruction of f(T) Gravity from Gaussian Processes
title_fullStr Model-independent Reconstruction of f(T) Gravity from Gaussian Processes
title_full_unstemmed Model-independent Reconstruction of f(T) Gravity from Gaussian Processes
title_sort Model-independent Reconstruction of f(T) Gravity from Gaussian Processes
dc.creator.none.fl_str_mv Cai, Yifu
Khurshudyan, Martiros
Saridakis, Emmanuel
author Cai, Yifu
author_facet Cai, Yifu
Khurshudyan, Martiros
Saridakis, Emmanuel
author_role author
author2 Khurshudyan, Martiros
Saridakis, Emmanuel
author2_role author
author
dc.contributor.none.fl_str_mv National Natural Science Foundation of China
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Cosmological parameters
Gaussian process
Test of modified gravity
topic Cosmological parameters
Gaussian process
Test of modified gravity
description We apply Gaussian processes and Hubble function data in f(T) cosmology to reconstruct for the first time the f(T) form in a model-independent way. In particular, using H(z) data sets coming from cosmic chronometers as well as from the method of radial baryon acoustic oscillations, alongside the latest released local value of H = 73.52 1.62 km s Mpc, we reconstruct H(z) and its derivatives, resulting eventually in a reconstructed region for f(T), without any assumption. Although the cosmological constant lies in the central part of the reconstructed region, the obtained mean curve follows a quadratic function. Inspired by this we propose a new f(T) parameterization, i.e., f(T) =-2Λ + ξT , with ξ the sole free parameter that quantifies the deviation from ΛCDM cosmology. Additionally, we confront three viable one-parameter f(T) models from the literature, which are the power-law, the square-root exponential, and the exponential models, with the reconstructed f(T) region, and then we extract significantly improved constraints for their model parameters, comparing to the constraints that arise from the usual observational analysis. Finally, we argue that since we are using the direct Hubble measurements and the local value for H in our analysis, the H tension can be efficiently alleviated with the above reconstruction of f(T).
publishDate 2020
dc.date.none.fl_str_mv 2020
2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Preprint
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/235483
url http://hdl.handle.net/10261/235483
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://doi.org/10.3847/1538-4357/ab5a7f
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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