Efficient electroweak baryogenesis by black holes

Aliferis, Georgios; Kofinas, Georgios; Zarikas, Vasilios

doi:10.1103/physrevd.91.045002

Cited by 19 publications

(18 citation statements)

References 69 publications

(93 reference statements)

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“…In the cosmological context, baryogenesis is an important issue, and the current study motivates us to approach baryogenesis with the present extension, as also suggested in Ref. [18].…”

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confidence: 74%

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First-order framework for flat brane with auxiliary fields

2014

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This work deals with braneworld models in the presence of auxiliary fields. We investigate the case where Einstein's equation is modified with the inclusion of extra, non-dynamical terms. We show that the model supports first-order differential equations that solve the equations of motion, but the standard braneworld scenario changes under the presence of the parameter that controls the non-dynamical or auxiliary fields that modifies Einstein's equation.Comment: 4 pages, 4 figures; new version: fig. 2 changed, text and references added; to appear in PR

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“…In the cosmological context, baryogenesis is an important issue, and the current study motivates us to approach baryogenesis with the present extension, as also suggested in Ref. [18].…”

mentioning

confidence: 74%

“…The energy density(18), depicted for α = 0 (solid line), α = 0.2 (dashed line) and α = 0.4 (dot-dashed line).…”

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confidence: 99%

First-order framework for flat brane with auxiliary fields

2014

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“…Thus, at that length one should join the presented solutions with the quantum corrected one that includes both fields Λ and G, which consequently for even larger length scales should turn into the the classical Schwarzschild black hole. The present work could also be useful in other directions that utilize quantum corrected black holes to explain baryogenesis [63], stability issues [64], or dark energy [65].…”

Section: Discussionmentioning

confidence: 99%

Avoidance of singularities in asymptotically safe Quantum Einstein Gravity

Kofinas

Zarikas

2015

J. Cosmol. Astropart. Phys.

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New general spherically symmetric solutions have been derived with a cosmological "constant" Λ as a source. This Λ field is not constant but it satisfies the properties of the asymptotically safe gravity at the ultraviolet fixed point. The importance of these solutions comes from the fact that they describe the near to the centre region of black hole spacetimes as this is modified by the Renormalization Group scaling behaviour of the fields. The consistent set of field equations which respect the Bianchi identities is derived and solved. One of the solutions (with conventional sign of temporal-radial metric components) is timelike geodesically complete, and although there is still a curvature divergent origin, this is never approachable by an infalling massive particle which is reflected at a finite distance due to the repulsive origin. Another family of solutions (of both signatures) range from a finite radius outwards, they cannot be extended to the centre of spherical symmetry, and the curvature invariants are finite at the minimum radius. * Electronic address: gkofinas@aegean.gr † Electronic address: vzarikas@teilam.gr

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“…Two Higgs doublet models(2HDM) are simple extensions of the SM in which the scalar sector of the SM is enlarged to contain new scalars [57][58][59][60][61][62]. Based on the couplings of the new scalars to quarks and leptons we can classify these models to several types such as type I, II or III [63].…”

Section: Cp Asymmetry Ofmentioning

confidence: 99%

Exploring new physics contributions to CP violation in $$\tau ^- \rightarrow K^-\pi ^0\nu _{\tau } $$

2021

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A general analysis of possible violation of CP in processes like $$\tau \rightarrow K\pi \nu $$ τ → K π ν , for unpolarized $$\tau $$ τ is presented. In this paper, we derive the new contributions to the effective Hamiltonian governs $$\vert \Delta S \vert =1$$ | Δ S | = 1 semileptonic tau decays in the framework of two Higgs doublet model with generic Yukawa structure and Leptoquarks models. Within these models, we list all operators, in the effective Hamiltonian and provide analytical expression for their corresponding Wilson coefficients. Moreover, we analyze the role of the different contributions, originating from the scalar, vecor and tensor hadronic currents, in generating direct CP asymmetry in the decay rate of $$\tau ^-\rightarrow K^-\pi ^0\nu _\tau $$ τ - → K - π 0 ν τ . We show that non vanishing direct CP asymmetry in the decay rate of $$\tau ^-\rightarrow K^-\pi ^0\nu _\tau $$ τ - → K - π 0 ν τ can be generated due to the presence of both, the weak phase in the Wilson coefficient corresponding to the tensor operator and the strong phase difference resulting from the interference between the form factors expressing the matrix elements of the vector and tensor hadronic currents. After taking into account all relevant constraints, we find that the generated direct CP asymmetry is of order $$10^{-8}$$ 10 - 8 which is several orders of magnitude larger than the standard model prediction. We show also that, in two Higgs doublet model with generic Yukawa structure , direct local or non integrated CP violation can be as large as 0.3 % not far from experimental possibilities. This kind of asymmetry can be generated due to the interference between vector and scalar contributions with different weak phases which is not the case in the SM.

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Efficient electroweak baryogenesis by black holes

Cited by 19 publications

References 69 publications

First-order framework for flat brane with auxiliary fields

First-order framework for flat brane with auxiliary fields

Avoidance of singularities in asymptotically safe Quantum Einstein Gravity

Exploring new physics contributions to CP violation in $$\tau ^- \rightarrow K^-\pi ^0\nu _{\tau } $$

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