Matter bounce cosmology with the f(T) gravity

By Yi-Fu Cai, Shih-Hung Chen, J. Dent, S. Dutta, Emmanuel N. Saridakis. 2011

443 citations recorded by the source corpus.

We show that the f(T) gravitational paradigm, in which gravity is described by an arbitrary function of the torsion scalar, can provide a mechanism for realizing bouncing cosmologies, thereby avoiding the Big Bang singularity. After constructing the simplest version of an f(T) matter bounce, we investigate the scalar and tensor modes of cosmological perturbations. Our results show that metric perturbations in the scalar sector lead to a background-dependent sound speed, which is a distinguishable feature from Einstein gravity. Additionally, we obtain a scale-invariant primordial power spectrum, which is consistent with cosmological observations, but suffers from the problem of a large tensor-to-scalar ratio. However, this can be avoided by introducing extra fields, such as a matter bounce curvaton. Communicated by P R L V Moniz

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8e0593ba207ce4738a5516564ae3952501e387ee

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Citations in the corpus

Bouncing Cosmologies: Progress and Problems (2016, unknown): “[101]).”
The matter bounce scenario in loop quantum cosmology (2012, unknown): “Two matter bounce cosmologies that give similar predictions are (i) with a Lee-Wick type scalar field that causes a bounce [19] (the case where the LeeWick scalar is non-minimally coupled to gravity is studied in [20]), and (ii) in the setting of the f(T ) generalization of teleparallel gravity [21]”
Exploring bouncing cosmologies with cosmological surveys (2014, background): “They appear in many theoretical settings where either the gravitational sector is modified as in Hor̆ava gravity [56–58], non-relativistic gravitational action[59], torsion gravity [60, 61], Lagrange-multiplier gravity [62, 63], nonlinear massive gravity [64] and non-local gravity [65], or by making”