Holographic Dark Energy Interacting with Two Fluids and Validity of Generalized Second Law of Thermodynamics - General Relativity and Quantum CosmologyReportar como inadecuado




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Abstract: We have considered a cosmological model of holographic dark energyinteracting with dark matter and another unknown component of dark energy ofthe universe. We have assumed two interaction terms $Q$ and $Q-$ in order toinclude the scenario in which the mutual interaction between the two principalcomponents i.e., holographic dark energy and dark matter of the universeleads to some loss in other forms of cosmic constituents. Our model is validfor any sign of $Q$ and $Q-$. If $QQ-$, then dark matter energy receives from dark energy andfrom the unknown component of dark energy. Observation suggests that darkenergy decays into dark matter. Here we have presented a general prescriptionof a cosmological model of dark energy which imposes mutual interaction betweenholographic dark energy, dark matter and another fluid. We have obtained theequation of state for the holographic dark energy density which is interactingwith dark matter and other unknown component of dark energy. Using first law ofthermodynamics, we have obtained the entropies for holographic dark energy,dark matter and other component of dark energy, when holographic dark energyinteracting with two fluids i.e., dark matter and other component of darkenergy. Also we have found the entropy at the horizon when the radius $L$ ofthe event horizon measured on the sphere of the horizon. We have investigatedthe GSL of thermodynamics at the present time for the universe enveloped bythis horizon. Finally, it has been obtained validity of GSL which implies somebounds on deceleration parameter $q$.



Autor: Ujjal Debnath

Fuente: https://arxiv.org/







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