Viable f(T) models are practically indistinguishable from ΛCDM
Entity
UAM. Departamento de Física TeóricaDate
2013-11-25Citation
10.1103/PhysRevD.88.103010
Physical Review D 88.10 (2013): 103010
ISSN
1550-7998 (print); 1550-2368 (online)DOI
10.1103/PhysRevD.88.103010Funded by
S.B. acknowledges support by the Research Center for Astronomy of the Academy of Athens in the context of the program ‘‘Tracing the Cosmic Acceleration.’’ S. N. acknowledges financial support from the Madrid Regional Government (CAM) under the program HEPHACOS S2009/ESP-1473-02, from MICINN under Grant No. AYA2009-13936-C06-06 and Consolider- Ingenio 2010 PAU (CSD2007-00060), as well as from the European Union Marie Curie Initial Training Network UNILHC PITN-GA-2009-237920. S. N. also acknowledges the support of the Spanish MINECO’s ‘‘Centro de Excelencia Severo Ochoa’’ Program under Grant No. SEV-2012-0249. The research of E. N. S. is implemented within the framework of the Action ‘‘Supporting Postdoctoral Researchers’’ of the Operational Program ‘‘Education and Lifelong Learning’’ Actionâs Beneficiary: (General Secretariat for Research and Technology) and is cofinanced by the European Social Fund (ESF) and the Greek State. This research has been cofinanced by the European Union (European Social Fund—ESF) and Greek national funds through the Operational Program ‘‘Education and Lifelong Learning’’ of the National Strategic Reference Framework (NSRF)—Research Funding Program: THALIS. Investing in the society of knowledge through the European Social FundProject
Comunidad de Madrid. S2009/ESP-1473/HEPHACOS; info:eu-repo/grantAgreement/EC/FP7/237920Editor's Version
http://dx.doi.org/10.1103/PhysRevD.88.103010Subjects
FísicaNote
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMRights
© 2013 American Physical SocietyAbstract
We investigate the cosmological predictions of several ƒ(T) models, with up to two parameters, at both the background and the perturbation levels. Using current cosmological observations (geometric supernovae type Ia, cosmic microwave background and baryonic acoustic oscillation and dynamical growth data) we impose constraints on the distortion parameter, which quantifies the deviation of these models from the concordance Λ cosmology at the background level. In addition we constrain the growth index Λ predicted in the context of these models using the latest perturbation growth data in the context of three parametrizations for γ. The evolution of the best fit effective Newton constant, which incorporates the ƒ(T)-gravity effects, is also obtained along with the corresponding 1σ error regions. We show that all the viable parameter sectors of the ƒ(T) gravity models considered practically reduce these models to ΛCDM. Thus, the degrees of freedom that open up to ΛCDM in the context of ƒ(T) gravity models are not utilized by the cosmological data leading to an overall disfavor of these models
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Google Scholar:Nesseris, Savvas
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Basilakos, S.
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Saridakis, E. N.
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Perivolaropoulos, L.
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