عنوان مجله
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GENERAL RELATIVITY AND GRAVITATION
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چکیده
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We consider a nonflat Friedmann–Robertson–Walker universe filled by a pressureless
dark matter and Tsallis holographic dark energy (THDE) whose IR cutoff is the
apparent horizon.We also consider both noninteracting and interacting cases in which
a mutual interaction between the two dark sectors of cosmos is taken into account.
For the noninteracting case, the density, equation of state (EoS) and the deceleration
parameters show a satisfactory behavior by themselves, and the phantom line is not
crossed. In this manner, unlike the flat case for THDE (Tavayef et al. in Phys Lett
B 781:195, 2018), where the squared of sound speed is always negative, the squared
of sound speed is negative and approaches zero at future. In the interacting case, the
phantom line is crossed by EoS parameter, the squared of the sound speed is always
negative and the density and deceleration parameters have acceptable behavior. Finally,
by studying the thermodynamic parameters, namely the heat capacities and the compressibility
criterions, the thermal stability of both cases are discussed which reveals
that both models are thermodynamically unstable.
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