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In this work we discuss a general approach for the dark energy thermodynamics considering a varying equation of state (EoS) parameter of the type $omega(a)=omega_0+F(a)$ and taking into account the role of a non-zero chemical potential $mu$. We derive generalized expressions for the entropy density, chemical potential and dark energy temperature $T$ and use the positiveness of the entropy to impose thermodynamic bounds on the EoS parameter $omega(a)$. In particular, we find that a phantom-like behavior $omega(a)< -1$ is allowed only when the chemical potential assumes negative values ($mu<0$).
So far, there have been no theories or observational data that deny the presence of interaction between dark energy and dark matter. We extend naturally the holographic dark energy (HDE) model, proposed by Granda and Oliveros, in which the dark energ
We present a systematic exploration of dark energy and modified gravity models containing a single scalar field non-minimally coupled to the metric. Even though the parameter space is large, by exploiting an effective field theory (EFT) formulation a
We explain dark energy with equipartition theorem in string landscape.
In this paper we introduce the fractional dark energy model, in which the accelerated expansion of the Universe is driven by a nonrelativistic gas (composed by either fermions or bosons) with a noncanonical kinetic term. The kinetic energy is inverse
A number of stability criteria exist for dark energy theories, associated with requiring the absence of ghost, gradient and tachyonic instabilities. Tachyonic instabilities are the least well explored of these in the dark energy context and we here d