Modified cosmology through Barrow entropy

Abstract

We investigate the cosmological consequences of the modified Friedmann equations when the entropy associated with the apparent horizon, given by Barrow entropy, $S\sim A^{1+\delta /2}$, where $0\le \delta \le 1$, represents the amount of the quantum-gravitational deformation of the horizon. We study implications of this model in a flat Friedmann-Robertson-Walker (FRW) universe with/without cosmological constant. Taking the cosmological constant into account, this model can describe the current accelerated expansion, although the transition from deceleration phase to the acceleration phase takes place in the lower redshifts. We investigate the evolution of the scale factor and show that with increasing $\delta$, the value of the scale factor increases as well. We also estimate the age of the universe in Barrow cosmology which is smaller than the age of the universe in standard cosmology.

8 pages, 5 figures, two columns format, Accepted by Phys. Rev. D

References in corpus (10)

• Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
• Corrected Entropy-Area Relation and Modified Friedmann Equations
• Barrow entropic dark energy: A member of generalized holographic dark energy family
• Modified cosmology through spacetime thermodynamics and Barrow horizon entropy
• Entropic Corrections to Friedmann Equations
• The generalized second law of thermodynamics in the accelerating universe
• Friedmann equations from emergence of cosmic space
• Barrow agegraphic dark energy
• Barrow's black hole entropy and the equipartition theorem
• New explanation for accelerated expansion and flat galactic rotation curves

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• Constraints on Rényi Entropy through Primordial Big-Bang Nucleosynthesis and Baryogenesis
• Entropy Bounds and Holographic Dark Energy: Conflicts and Consensus
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