期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/08/008
关键词
dark energy theory; modified gravity; cosmological parameters from CMBR
资金
- Research Center for Astronomy of the Academy of Athens in the context of the program Testing general relativity on cosmological scales [200/872]
- MINECO-FEDER [FPA2015-68048-03-3P]
- Centro de Excelencia Severo Ochoa Program [SEV-2016-0597]
- Ramon y Cajal program [RYC-2014-15843]
- COST Action (European Cooperation in Science and Technology) Cosmology and Astrophysics Network for Theoretical Advances and Training Actions
We extract observational constraints on f(T) gravity, using the recently proposed statistical method which is not affected by the value of H-0 and thus it bypasses the problem of the disagreement in its exact numerical value between Planck and direct measurements. We use direct measurements of the Hubble parameter with the corresponding covariance matrix, and for completeness we perform a joint analysis using the latest data from Supernovae type Ia based on JLA sample, quasi-stellar objects, and Cosmic Microwave Background shift parameter from Planck. We analyze a large family of f(T) models, and we compare the fitting results with ACDM cosmology using the AIC statistical test. Utilizing only the Hubble parameter data we find that in the case of the power-law f(T) model a small but non-zero deviation from ACDM cosmology is slightly favored at 1-sigma, nevertheless the corresponding AIC value shows a statistical equivalence with it. Finally, the join analysis reveals that all f(T) models are very efficient and in very good agreement with observations.
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