Viability of the matter bounce scenario in F(T) gravity and Loop Quantum Cosmology forgeneral potentials
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We consider the matter bounce scenario in F (T) gravity and Loop Quantum Cosmology (LQC) for phenomenological potentials that at early times provide a nearly matter dominated Universe in the contracting phase, having a reheating mechanism in the expanding or contracting phase, i.e., being able to release the energy of the scalar field creating particles that thermalize in order to match with the hot Friedmann Universe, and finally at late times leading to the current cosmic acceleration. For these potentials, numerically solving the dynamical perturbation equations we have seen that, for the particular F (T) model that we will name tele parallelversion of LQC, and whose modified Friedmann equation coincides with the corresponding one in holonomy corrected LQC when one deals with the flat Friedmann-Lemai tre-Robertson-Walker (FLRW) geometry, the corresponding equations obtained from the well- know perturbed equations in F (T) gravity lead to theoretical results that fit well with current observational data. More precisely, in this teleparallelversion of LQC there is a set of solutions which leads to theoretical results that match correctly with last BICEP2 data, and there is another set whose theoretical results fit well with Planck's experimental data. On the other hand, in the standard holonomy corrected LQC, using the perturbed equations obtained replacing the Ashtekar connection by a suitable sinus function and inserting some counter-terms in order to preserve the algebra of constrains, the theoretical value of the tensor/scalar ratio is smaller than in the teleparallel version, which means that there is always a set of solutions that matches with Planck's data, but for some potentials BICEP2 experimental results disfavours holonomy corrected LQC.
CitacióHaro, J., Amoros, J. Viability of the matter bounce scenario in F(T) gravity and Loop Quantum Cosmology forgeneral potentials. "Journal of cosmology and astroparticle physics", 01 Desembre 2014, vol. 2014, núm. 12.