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.

arXiv comment8 pages, 5 figures, two columns format, Accepted by Phys. Rev. D

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• Constraining Barrow entropy-based Cosmology with power-law inflation
• Corrections to Friedmann equations inspired by Kaniadakis entropy
• Black hole geometrothermodynamics and critical phenomena: a look from Tsallis entropy-based perspective
• Holographic dark energy in modified Barrow cosmology
• Modified cosmology from quantum deformed entropy
• Note on agegraphic dark energy inspired by modified Barrow entropy
• Evolution of thermodynamic quantities on cosmological horizon in $\Lambda (t)$ model
• Holographic dark energy in Barrow cosmology with Granda-Oliveros IR cutoff
• Big-Bang nucleosynthesis constraints on (dual) Kaniadakis cosmology
• Barrow Cosmology and Big-Bang Nucleosynthesis
• Modified cosmology through Kaniadakis entropy
• Cosmological model based on both holographic-like connection and Padmanabhan's holographic equipartition law
• Gravitational wave probes of Barrow cosmology with LISA standard sirens
• A comprehensive analysis of Barrow holographic Chaplygin gas model reconstruction and its cosmological consequences
• Entropy as logarithmic term of the central charge and modified Friedmann equation in AdS/CFT correspondence
• Exponential correction to Friedmann equations
• MOND Theory and Thermodynamics of Spacetime
• Holographic thermodynamic relation for dissipative and non-dissipative universes in a flat FLRW cosmology
• The $D$-dimensional charged AdS black holes solutions in polytropic dark energy from Barrow entropy
• Spacetime Foam Effects on Charged AdS Black Hole Thermodynamics
• Constraints on Rényi Entropy through Primordial Big-Bang Nucleosynthesis and Baryogenesis
• Entropy Bounds and Holographic Dark Energy: Conflicts and Consensus
• Constant-roll inflation and primordial black holes within Barrow entropic framework
• Emergence of the cosmic space inspired by mass-to-horizon entropy
• Thermodynamic Split Conjecture and an Observational Test for Cosmological Entropy