Accelerated cosmos in a non-extensive setup
arXiv:1711.08338 · doi:10.1103/PhysRevD.96.123504
Abstract
Here, we consider a flat FRW universe whose its horizon entropy meets the Rényi entropy of non-extensive systems. In our model, the ordinary energy-momentum conservation law is not always valid. By applying the Clausius relation as well as the Cai-Kim temperature to the apparent horizon of a flat FRW universe, we obtain modified Friedmann equations. Fitting the model to the observational data on current accelerated universe, some values for the model parameters are also addressed. Our study shows that the current accelerating phase of universe expansion may be described by a geometrical fluid, originated from the non-extensive aspects of geometry, which models a varying dark energy source interacting with matter field in the Rastall way. Moreover, our results indicate that the probable non-extensive features of spacetime may also be used to model a varying dark energy source which does not interact with matter field, and is compatible with the current accelerated phase of universe.
Accepted by Phys. Rev. D
References in corpus (16)
- Extra force in modified theories of gravity
- Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
- Hawking Radiation of Apparent Horizon in a FRW Universe
- Generalized curvature-matter couplings in modified gravity
- Four-qubit entanglement from string theory
- Black Holes, Qubits and Octonions
- Phantom behavior via cosmological creation of particles
- The Brans-Dicke-Rastall theory
- Emergent cosmic space in Rastall theory
- Entropic cosmology in a dissipative universe
- The commutator algebra of covariant derivative as general framework for extended gravity. The Rastall theory case and the role of the torsion
- Ideal Gas in a strong Gravitational field: Area dependence of Entropy
- Renyi entropies of a black hole from Hawking radiation
- Universal thermodynamics in different gravity theories: Conditions for generalized second law of thermodynamics and thermodynamical equilibrium on the horizons
- A Study of Universal Thermodynamics in Lanczos-Lovelock gravity
- Cosmology from a Lagrangian formulation for Rastall's theory