Gravitational baryogenesis after anisotropic inflation

Fukushima, Mitsuhiro; Mizuno, Shuntaro; Maeda, Kei Ichi

doi:10.1103/physrevd.93.103513

Cited by 25 publications

(17 citation statements)

References 63 publications

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“…The scalar-vector coupling term has been shown to be a source of stable anisotropy. Consequently, many cosmological aspects of this model have been investigated extensively [67][68][69][70][71][72][73][74][75][76]. Along this line of research, the validity of the cosmic no-hair conjecture has been investigated systematically in some non-canonical extensions of the KSW model with the canonical scalar field model is replaced by non-canonical models.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Tuan

Kao

2018

Eur. Phys. J. C

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We will study the cosmological implications of the five dimensional scalar-vector and scalar-Kalb-Ramond model. In particular, a new set of Bianchi type I power-law analytic solution will be obtained for this model. The cosmic no-hair conjecture can be shown to break down in the presence of the scalar-vector and scalar-Kalb-Ramond couplings. The effect of the Kalb-Ramond field in the presence of the power-law solution will be shown explicitly. We will also show that the presence of a phantom field does, however, destabilize the corresponding Bianchi type I power-law inflationary solutions.

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Section: Introductionmentioning

confidence: 99%

Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Tuan

Kao

2018

Eur. Phys. J. C

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“…[32,33] that there exists an anisotropic power-law inflationary attractor yielding constant expansion anisotropy σ 2 /H 2 , in the presence of exponential scalar potential and such a coupling of the exponential form, which often appears in string theory and supergravity [34,35]. These studies are followed by many cosmological predictions [25,[36][37][38][39][40][41] and further extension to various models [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic inflation with a non-minimally coupled electromagnetic field to gravity

Adak¹,

Akarsu²,

Dereli³

et al. 2017

J. Cosmol. Astropart. Phys.

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We consider the non-minimal model of gravity in Y (R)F 2 -form. We investigate a particular case of the model, for which the higher order derivatives are eliminated but the scalar curvature R is kept to be dynamical via the constraintThe effective fluid obtained can be represented by interacting electromagnetic field and vacuum depending on Y (R), namely, the energy density of the vacuum tracks R while energy density of the conventional electromagnetic field is dynamically scaled with the factor2 . We give exact solutions for anisotropic inflation by assuming the volume scale factor of the Universe exhibits a power-law expansion. The directional scale factors do not necessarily exhibit power-law expansion, which would give rise to a constant expansion anisotropy, but expand non-trivially and give rise to a non-monotonically evolving expansion anisotropy that eventually converges to a non-zero constant. Relying on this fact, we discuss the anisotropic e-fold during the inflation by considering observed scale invariance in CMB and demanding the Universe to undergo the same amount of e-folds in all directions. We calculate the residual expansion anisotropy at the end of inflation, though as a result of non-monotonic behaviour of expansion anisotropy all the axes of the Universe undergo the same of amount of e-folds by the end of inflation. We also discuss the generation of the modified electromagnetic field during the first few e-folds of the inflation and its persistence against to the vacuum till end of inflation.

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“…Davoudiasl et al [9] have shown that the gravitational interaction between the baryon-number current and the derivative of Ricci scalar curvature dynamically breaks the CPT symmetry in an expanding Universe. Since the proposal of Davoudiasl et al, the gravitational baryogenesis has gained a lot of popularity and many generalizations of the original mechanism have been proposed [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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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Gravitational baryogenesis after anisotropic inflation

Cited by 25 publications

References 63 publications

Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Anisotropic inflation with a non-minimally coupled electromagnetic field to gravity

Gravitational baryogenesis models comparison in f(R) Gravity

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