Holographic dark energy in modified Kaniadakis cosmology

Abstract

It is well-known that any modification to the entropy expression not only change the energy density of the holographic dark energy, but also modifies the cosmological field equations through thermodynamics-gravity correspondence. Here we propose a Kaniadakis holographic dark energy (KHDE) in the background of the modified Kaniadakis cosmology by incorporating the effects of Kaniadakis entropy into the Friedmann equations. We choose the Hubble radius, $L=H^{-1}$, as system's IR cutoff and determine the cosmological implications of this model. We first consider a dark energy (DE) dominated universe and reveal that this model mimics the cosmological constant with $w_{DE}=-1$. This implies that the theoretical origin of the cosmological constant, $\Lambda$, may be understood through KHDE in the context of Kaniadakis cosmology. Remarkably, we observe that in the absence of interaction between DE and dark matter (DM), and in contrast to HDE in standard cosmology, our model can explain the current acceleration of the cosmic expansion for the Hubble radius as IR cutoff. When the interaction between DE and DM is taken into account, we see that the total equation of state parameter (EoS), $w_{tot}=p_{tot}/{\rho }_{tot}$ can cross the phantom line at the present time. We also analyze the squared speed of sound, $v_s^2$, for this model and find out that $(v_s^2<0)$ for interacting KHDE. Investigating the statefinder, confirms the distinction between KHDE and $\Lambda$CDM model. It is seen that the statefinder diagram move away from the point of $\left\{r,s\right\}=\left\{1,0\right\}$ with increasing the interaction parameter.

21 pages, 11 figures

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