Anisotropy effects on baryogenesis in <i>f</i>(<i>R</i>) theories of gravity

Aghamohammadi, Amir; Hossienkhani, H.; Saaidi, Kh.

doi:10.1142/s0217732318500724

Cited by 10 publications

(5 citation statements)

References 59 publications

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“…Basing on the covariant non-equilibrium thermodynamic description, Lima et al [46,47] have derived the standard expressions for the energy density ρ R and number density n R as the function of the temperature i.e., ρ R ∝ T 4 R and n R ∝ T 3 R . Moreover, the expression for ρ has been suggested as [41],…”

Section: A Model Imentioning

confidence: 99%

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Gravitational baryogenesis models comparison in f(R) Gravity

Agrawal,

Tripathy,

Mishra

2021

Preprint

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We have studied the gravitational baryogenesis in f (R) theory of gravity with an anisotropic Bianchi I space-time. The matter field is considered to be that of perfect fluid. Two models pertaining to specific form of Ricci scalar have been presented. The baryon-to-entropy ratio has been derived with the some specific form of Ricci scalar in the anisotropic background. The gravitational baryogenesis is examined and its behaviors are studied.

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Section: A Model Imentioning

confidence: 99%

“…Nozari and Rajabi [40] explored the issue of baryon asymmetric with f (R, T ) gravity. Aghamohammadi et al [41] have studied the effect of f (R) gravity on the baryon-to-entropy ratio. Arbuzova and Dolgov [42] have shown the instability effects both in gravitational baryogenesis and in f (R) gravity.…”

Section: Introductionmentioning

confidence: 99%

Gravitational baryogenesis models comparison in f(R) Gravity

Agrawal,

Tripathy,

Mishra

2021

Preprint

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“…The dynamical evolution of an f (R) model of gravity in a viscous and anisotropic background given by B-I space-time is discussed by Saaidi et al [33]. Also, the anisotropy effects on baryogenesis in f (R) gravity are examined in reference [34].…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of anisotropic Bianchi type-I cosmological model in teleparallel gravity

Koussour

Bennai

2022

Class. Quantum Grav.

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In this work, we study a cosmological model of Bianchi type-I Universe in teleparallel gravity for a perfect fluid. To obtain the cosmological solution of the model, we assume that the deceleration parameter is a linear function of the Hubble parameter H i.e. q=-1+βH (where β as a positive constant). Consequently, we get a model of our Universe, where it goes from the initial phase of deceleration to the current phase of acceleration. We have discussed some physical and geometric properties such as Hubble parameter, deceleration parameter, energy density, pressure, and equation of state (EoS) parameter and study their behavior graphically in terms of redshift and compare it with observational data such as Type Ia supernovae (SNIa). We also discussed the behavior of other parameters such as the Jerk parameter, Statefinder parameters and we tested the validity of the model by studying the stability analysis and energy conditions.

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“…In [19] the baryon asymmetry is generated dynamically during an inflationary epoch powered by ultra-relativistic particle production. In [20][21][22] has been suggested that anisotropy of the universe can enhance the generation of the baryon asymmetry. The authors of [22] clarified, if we into account the gravitino problem (T RD < 10 9 GeV ), gravitational baryogenesis [9] is incapable to explain generation of sufficient baryon asymmetry.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic inflation in non-minimal kinetic coupling model

Goodarzi

2022

J. Cosmol. Astropart. Phys.

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We study anisotropic inflation in non-minimal derivative coupling model where the scalar field non-minimally coupled to the U(1) gauge fields and derivative of the scalar field non-minimally coupled to the Einstein tensor. Within the framework we find power-law anisotropic solutions in this model when both the inflaton potential and the gauge kinetic function are power-law type in the high friction regime. We show the ratio of anisotropy to the expansion rate is nearly constant, small and proportional to the slow-roll parameters of the theory. As a demonstration, we consider numerically calculation of the model to show that the behavior of anisotropy by changing the parameters of the model for quadratic inflationary potential. There is anisotropic attractor solution for a wide range of values of the model parameters. We show both numerically and analytically that there are two phases of inflation, similar to those an anisotropic inflation in minimal coupling model, isotropic and anisotropic phase. We can change the number of e-folds corresponding to each phase of slow roll inflation by changing the gauge coupling constant or non-minimal derivative coupling constant. There are the best agreement with the numerically solutions and analytically solutions in this investigation.

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Anisotropy effects on baryogenesis in f(R) theories of gravity

Cited by 10 publications

References 59 publications

Gravitational baryogenesis models comparison in f(R) Gravity

Gravitational baryogenesis models comparison in f(R) Gravity

Stability analysis of anisotropic Bianchi type-I cosmological model in teleparallel gravity

Anisotropic inflation in non-minimal kinetic coupling model

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