عنوان مجله
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CANADIAN JOURNAL OF PHYSICS
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چکیده
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In this paper, at first, we focus on a Friedmann–Robertson–Walker (FRW) universe in which the dark energy candidate
satisfies the polytropic equation of state and study thermodynamics of dark energy. Bearing the thermal fluctuation theorem in
mind, we establish a relation between the thermal fluctuation of the system and mutual interaction between the dark energy
and dark matter. Generalization to a viscous polytropic gas is also investigated. We point to a condition for decaying the dark
energy candidate into the dark matter needed for alleviating the coincidence problem. The effects of dark energy candidates and
their interactions with other parts of the cosmos on the horizon entropy as well as the second law of thermodynamics are also
addressed. Our study suggests a correction term besides the Bekenstein entropy, which carries the information of the dark
energy candidate, its interaction with other parts of the cosmos, and its viscosity.
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