Baryon asymmetry from Barrow entropy: theoretical predictions and observational constraints

Abstract

We investigate the generation of baryon asymmetry from the corrections brought about in the Friedman equations due to Barrow entropy. In particular, by applying the gravity-thermodynamics conjecture one obtains extra terms in the Friedmann equations that change the Hubble function evolution during the radiation-dominated epoch. Hence, even in the case of standard coupling between the Ricci scalar and baryon current they can lead to a non-zero baryon asymmetry. In order to match observations we find that the Barrow exponent should lie in the interval $0.005\lesssim \Delta \lesssim 0.008$, which corresponds to a slight deviation from the standard Bekenstein-Hawking entropy. The upper bound is tighter than the one of other observational constraints, however the interesting feature is that in the present analysis we obtain a non-zero lower bound. Nevertheless this lower bound would disappear if the baryon asymmetry in Barrow-modified cosmology is generated by other mechanisms, not related to the Barrow modification.

arXiv comment6 pages, 1 figure

References in corpus (56)

• Thermodynamics of Spacetime: The Einstein Equation of State
• Thermodynamical Aspects of Gravity: New insights
• First Law of Thermodynamics and Friedmann Equations of Friedmann-Robertson-Walker Universe
• Recent Progress in Baryogenesis
• Statistical mechanics in the context of special relativity
• Gravity and the Thermodynamics of Horizons
• Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
• Non-equilibrium Thermodynamics of Spacetime
• The Area of a Rough Black Hole
• Matter and Antimatter in the Universe
• Unified First Law and Thermodynamics of Apparent Horizon in FRW Universe
• 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
• Generalized entropy formalism and a new holographic dark energy model
• Barrow holographic dark energy
• Thermodynamical Properties of Apparent Horizon in Warped DGP Braneworld
• Inflation and de Sitter Thermodynamics
• Gravitational Baryogenesis
• Thermodynamics of dark energy interacting with dark matter and radiation
• Deep Connection Between Thermodynamics and Gravity in Gauss-Bonnet Braneworld
• Holographic dark energy through Tsallis entropy
• Modified cosmology from extended entropy with varying exponent
• Modified Friedmann Equations from Tsallis Entropy
• Big Bang Nucleosynthesis constraints on Barrow entropy
• Modified cosmology through spacetime thermodynamics and Barrow horizon entropy
• The generalized second law of thermodynamics with Barrow entropy
• Probing the cosmological viability of non-gaussian statistics
• Generalized second law of thermodynamics in Gauss-Bonnet braneworld
• Barrow Entropy Corrections to Friedmann Equations
• Gravitational Leptogenesis and Its Signatures in CMB
• Baryogenesis in $f(R)$-Theories of Gravity
• Baryogenesis from ultralight primordial black holes and strong gravitational waves from cosmic strings
• Gauss-Bonnet Gravitational Baryogenesis
• Modified cosmology through nonextensive horizon thermodynamics
• $f(T)$ gravitational baryogenesis
• Modified cosmology through Kaniadakis horizon entropy
• Gravitational and Chiral Anomalies in the Running Vacuum Universe and Matter-Antimatter Asymmetry
• Gravitational Leptogenesis and Neutrino Mass Limit
• Neutrino coupling to cosmological background: A review on gravitational Baryo/Leptogenesis
• Geometrical observational bounds on a fractal horizon holographic dark energy
• Barrow Entropy Cosmology: an observational approach with a hint of stability analysis
• de Sitter thermodynamics and the braneworld
• A Note on Gravitational Baryogenesis
• New explanation for accelerated expansion and flat galactic rotation curves
• Baryon Asymmetry from the Generalized Uncertainty Principle
• Gravitational baryogenesis in Gauss-Bonnet braneworld cosmology
• Generalized Gravitational Baryogenesis of Well-Known $f(T,T_G)$ and $f(T,B)$ Models
• Standard Model Extension with Gravity and Gravitational Baryogenesis
• Statistical approaches on the apparent horizon entropy and the generalized second law of thermodynamics
• q-generalized Tsallis thermostatistics in Unruh effect for mixed fields
• Gravitational baryogenesis models comparison in f(R) Gravity
• Nonextensive Tsallis statistics in Unruh effect for Dirac neutrinos
• Inflationary Birefringence and Baryogenesis
• Spontaneous symmetry breaking in the late Universe and glimpses of early Universe phase transitions à la baryogenesis
• Gravitationally Induced Dark Matter Asymmetry and Dark Nucleon Decay
• Baryogenesis in $f(P)$ Gravity

Cited by in corpus (13)

• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Barrow holographic dark energy with Granda-Oliveros cut-off
• Cosmic evolution and thermal stability of Barrow holographic dark energy in nonflat Friedmann-Robertson-Walker Universe
• Barrow holographic dark energy in the Brans-Dicke cosmology
• Constraining Barrow entropy-based Cosmology with power-law inflation
• Equilibrium Temperature for Black Holes with Nonextensive Entropy
• Saez-Ballester gravity in Kantowski-Sachs Universe: a new reconstruction paradigm for Barrow Holographic Dark Energy
• Generalized interacting Barrow Holographic Dark Energy: cosmological predictions and thermodynamic considerations
• Lagrangian reconstruction of Barrow holographic dark energy in interacting tachyon model
• Barrow entropy and stochastic gravitational wave background generated from cosmological QCD phase transition
• Gauge-invariant perturbations at a quantum gravity bounce
• Fractal properties of particle paths due to generalised uncertainty relations
• Sign Switching Dark Energy from a Running Barrow Entropy