Modified cosmology through spacetime thermodynamics and Barrow horizon entropy

Abstract

We present modified cosmological scenarios that arise from the application of the "gravity-thermodynamics" conjecture, using the Barrow entropy instead of the usual Bekenstein-Hawking one. The former is a modification of the black hole entropy due to quantum-gravitational effects that deform the black-hole horizon by giving it an intricate, fractal structure. We extract modified cosmological equations which contain new extra terms that constitute an effective dark-energy sector, and which coincide with the usual Friedmann equations in the case where the new Barrow exponent acquires its Bekenstein-Hawking value. We present analytical expressions for the evolution of the effective dark energy density parameter, and we show that the universe undergoes through the usual matter and dark-energy epochs. Additionally, the dark-energy equation-of-state parameter is affected by the value of the Barrow deformation exponent and it can lie in the quintessence or phantom regime, or experience the phantom-divide crossing. Finally, at asymptotically large times the universe always results in the de-Sitter solution.

arXiv comment12 pages, 3 figures

References in corpus (35)

• Planck 2015 results. XIII. Cosmological parameters
• Dynamics of dark energy
• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• f(R) theories
• Extended Theories of Gravity
• Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
• Thermodynamics of Spacetime: The Einstein Equation of State
• f(T) teleparallel gravity and cosmology
• Modified Gauss-Bonnet theory as gravitational alternative for dark energy
• Dark torsion as the cosmic speed-up
• Non-Gaussianity from Inflation: Theory and Observations
• Thermodynamical Aspects of Gravity: New insights
• Quintom Cosmology: Theoretical implications and observations
• First Law of Thermodynamics and Friedmann Equations of Friedmann-Robertson-Walker Universe
• Interpretation of the nonextensitivity parameter $q$ in some applications of Tsallis statistics and Lévy distributions
• Gravity and the Thermodynamics of Horizons
• Cosmology in $f(Q)$ geometry
• Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
• Nonextensivity and multifractality in low-dimensional dissipative systems
• Cosmological perturbations in f(T) gravity
• Friedmann Equations of FRW Universe in Scalar-tensor Gravity, f(R) Gravity and First Law of Thermodynamics
• Thermodynamic route to Field equations in Lanczos-Lovelock Gravity
• Hawking Radiation of Apparent Horizon in a FRW Universe
• Dark energy and the generalized second law
• Teleparallel equivalent of Gauss-Bonnet gravity and its modifications
• Thermodynamical Properties of Apparent Horizon in Warped DGP Braneworld
• Inflation and de Sitter Thermodynamics
• Thermodynamics of dark energy interacting with dark matter and radiation
• Horizon Thermodynamics and Gravitational Field Equations in Horava-Lifshitz Gravity
• Resembling dark energy and modified gravity with Finsler-Randers cosmology
• The generalized second law of thermodynamics in Horava-Lifshitz cosmology
• Modified cosmology through nonextensive horizon thermodynamics
• Thermodynamical First Laws of Black Holes in Quadratically-Extended Gravities
• The first law of thermodynamics in Lifshitz black holes revisited
• First laws of thermodynamics in IR Modified Hǒrava-Lifshitz gravity

Cited by in corpus (62)

• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• The Area of a Rough Black Hole
• Barrow Entropy Corrections to Friedmann Equations
• Barrow holographic dark energy with Hubble horizon as IR cutoff
• Modified cosmology through Kaniadakis horizon entropy
• Prospecting Black Hole Thermodynamics with Fractional Quantum Mechanics
• Barrow agegraphic dark energy
• Constraints on Barrow entropy from M87* and S2 star observations
• Barrow black hole corrected-entropy model and Tsallis nonextensivity
• Barrow Entropy Cosmology: an observational approach with a hint of stability analysis
• Baryon asymmetry from Barrow entropy: theoretical predictions and observational constraints
• Modified cosmology through Barrow entropy
• Growth of Perturbations in Tsallis and Barrow Cosmology
• Alleviating both $H_0$ and ${\sigma }_8$ tensions in Tsallis cosmology
• Statefinder hierarchy model for the Barrow holographic dark energy
• Observational constraints of the modified cosmology through Barrow entropy
• $P-v$ criticalities, phase transitions and geometrothermodynamics of charged AdS black holes from Kaniadakis statistics
• Constraining Barrow entropy-based Cosmology with power-law inflation
• Corrections to Friedmann equations inspired by Kaniadakis entropy
• Barrow Entropy and AdS Black Holes in RPS Thermodynamics
• Imprints of Barrow-Tsallis Cosmology in Primordial Gravitational Waves
• Holographic dark energy in modified Barrow cosmology
• Modified cosmology from quantum deformed entropy
• The effects of q-statistics on cosmology
• Barrow and Tsallis entropies after the DESI DR2 BAO data
• Barrow Holographic Dark Energy Model with GO Cut-off -- An Alternative Perspective
• Holographic and Gravity-Thermodynamic Approaches in Entropic Cosmology: Bayesian Assessment using late-time Data
• Note on agegraphic dark energy inspired by modified Barrow entropy
• Modified Friedmann equations from fractional entropy
• Barrow entropic Quintessence and Dilation dark energy Models with Generalized HDE cut-off
• Holographic dark energy in Barrow cosmology with Granda-Oliveros IR cutoff
• Horizon thermodynamics and cosmological equations: A holographic-like connection between thermostatistical quantities on a cosmological horizon and in the bulk
• Interacting Barrow Holographic Dark Energy in Non-flat Universe
• Look beyond additivity and extensivity of entropy for black hole and cosmological horizons
• A study of holographic dark energy models using configuration entropy
• Barrow Cosmology and Big-Bang Nucleosynthesis
• Big-Bang nucleosynthesis constraints on (dual) Kaniadakis cosmology
• Anisotropic Conformal Dark Gravity on the Lorentz Tangent Bundle Spacetime
• Topological and optical signatures of modified black-hole entropies
• Quantum Entropy-Driven Modifications to Holographic Dark Energy in $f(G,T)$ Gravity
• Gravitational wave probes of Barrow cosmology with LISA standard sirens
• Barrow holographic dark energy interacting model in the presence of radiation and matter
• Constraints on Generalized Gravity-Thermodynamic Cosmology from DESI DR2
• Modified cosmology through generalized mass-to-horizon entropy: observational constraints from DESI DR2 BAO data
• Hints Beyond $\Lambda$CDM from Barrow and Tsallis Holographic Dark Energy with GO cutoff
• Thermodynamics of a transient phantom scenario
• Thermodynamic Topology and Photon Spheres Analysis of Black Holes in Brane-World: Insights from Barrow Entropy
• MOND Theory and Thermodynamics of Spacetime
• Exponential correction to Friedmann equations
• The $D$-dimensional charged AdS black holes solutions in polytropic dark energy from Barrow entropy
• Observational constraints and dynamical analysis of Kaniadakis horizon-entropy cosmology
• Friedmann equations from GUP-modified equipartition law
• Constraints on Rényi Entropy through Primordial Big-Bang Nucleosynthesis and Baryogenesis
• Observational constraints on Luciano-Saridakis entropic cosmology
• Constant-roll inflation and primordial black holes within Barrow entropic framework
• Observational constraints on the modified cosmology inspired by string T-duality
• From MOND entropy to extended uncertainty principles: A unified framework
• Impact of the Infrared Cutoff on Structure Formation in Tsallis Holographic Dark Energy
• Statistical physics on Euclidean Snyder space: connections with the GUP and cosmological implications
• A Combined Barrow Entropy and QCD Ghost Mechanism for Late-Time Cosmic Acceleration
• Linearly Interacting Barrow Holographic Dark Energy in Modified Cosmology
• Sign Switching Dark Energy from a Running Barrow Entropy