https://doi.org/10.1140/epjc/s10052-017-4798-5
Regular Article - Theoretical Physics
Observational constraints on f(T) gravity from varying fundamental constants
1
Departamento de Física, Universidade Federal de Juiz de Fora, 36036-330, Juiz de Fora, MG, Brazil
2
Department of Physical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur, West Bengal, 741246, India
3
Instituto de Física, Pontificia Universidad de Católica de Valparaíso, Casilla, 4950, Valparaíso, Chile
4
Physics Division, National Technical University of Athens, Zografou Campus, 15780, Athens, Greece
5
CASPER, Physics Department, Baylor University, Waco, TX, 76798-7310, USA
* e-mail: span@iiserkol.ac.in
Received:
11
November
2016
Accepted:
28
March
2017
Published online:
11
April
2017
We use observations related to the variation of fundamental constants, in order to impose constraints on the viable and most used f(T) gravity models. In particular, for the fine-structure constant we use direct measurements obtained by different spectrographic methods, while for the effective Newton constant we use a model-dependent reconstruction, using direct observational Hubble parameter data, in order to investigate its temporal evolution. We consider two f(T) models and we quantify their deviation from 
CDM cosmology through a sole parameter. Our analysis reveals that this parameter can be slightly different from its CDM value, however, the best-fit value is very close to the CDM one. Hence, f(T) gravity is consistent with observations, nevertheless, as every modified gravity, it may exhibit only small deviations from CDM cosmology, a feature that must be taken into account in any f(T) model-building.
© The Author(s), 2017
