Energy conditions in $F(T,Θ)$ gravity and compatibility with a stable de Sitter solution

We study a new type of the modified teleparallel gravity of the form $F(T,\,Θ)$ in which $T$, the torsion scalar, is coupled with $Θ$, the trace of the stress-energy tensor. In a perturbational approach, we study the stability of the solutions and as a special case we find a condition for stability of the de Sitter phase. Then we adopt a suitable form for $F(T,Θ)$ that realizes a stable de Sitter solution so that the stability condition creates a specific constraint on the parametric space of the model. Finally, the energy conditions in the framework of $F(T,Θ)$ gravity is investigated.

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