Reconstruction, Thermodynamics and Stability of CDM Model in Gravity

ELB Junior, ME Rodrigues, IG Salako… - arXiv preprint arXiv …, 2015 - arxiv.org
arXiv preprint arXiv:1501.00621, 2015arxiv.org
We reconstruct the $\Lambda $ CDM model for $ f (T,\mathcal {T}) $ Theory, where $ T $ is
the torsion scalar and $\mathcal {T} $ the trace of the energy-momentum tensor. The result
shows that the action of $\Lambda $ CDM is a combination of a linear term, a constant ($-
2\Lambda $) and a non-linear term given by the product $\sqrt {-T} F_g\left [(T^{1/3}/16\pi
G)\left (16\pi G\mathcal {T}+ T+ 8\Lambda\right)\right] $, with $ F_g $ being a generic
function. We show that to maintain conservation of energy-momentum tensor should impose …
We reconstruct the CDM model for Theory, where is the torsion scalar and the trace of the energy-momentum tensor. The result shows that the action of CDM is a combination of a linear term, a constant () and a non-linear term given by the product $\sqrt{-T}F_g\left[(T^{1/3}/16\pi G)\left(16\pi G\mathcal{T}+T+8\Lambda\right)\right]$, with being a generic function. We show that to maintain conservation of energy-momentum tensor should impose that must be linear on the trace . This reconstruction decays in the Theory for , with a constant. Our reconstruction describes the cosmological eras to the present time. The model present stability within the geometric and matter perturbations for the choice , where , except for geometric part to de Sitter model. We impose the first and second laws of thermodynamics to the CDM and find the condition where they are satisfied, that is, , however where this is not possible for cases where we choose, leading to a breakdown of positive entropy and Misner-Sharp energy.
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