Baryogenesis and Cosmological Antimatter

Dolgov, A. D.

doi:10.1063/1.3131550

Cited by 6 publications

(5 citation statements)

References 41 publications

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“…There are two main proposals addressing the lack of observed antimatter atoms. The most commonly accepted idea is that there was a time in the evolution of the Universe when the baryon number was not conserved, allowing matter atoms to survive as is observed today [28,29]. The other idea is that somehow the surviving antimatter atoms have formed into objects (e.g., stars and galaxies) which cannot be detected today [28,29].…”

Section: Adding Antimatter Atoms To the Concordance Modelmentioning

confidence: 99%

“…The most commonly accepted idea is that there was a time in the evolution of the Universe when the baryon number was not conserved, allowing matter atoms to survive as is observed today [28,29]. The other idea is that somehow the surviving antimatter atoms have formed into objects (e.g., stars and galaxies) which cannot be detected today [28,29]. This second idea predicts that antimatter atoms should clump together in a manner similar to that of matter atoms.…”

Section: Adding Antimatter Atoms To the Concordance Modelmentioning

confidence: 99%

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Cancelled: Using External Galactic Forces as an Alternative to Dark Matter

Neal¹

2022

Redefining Standard Model Particle Physics [Cancelled Title]

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There have been no shortage of theories to describe Dark Matter. Most of the current theories have one thing in common, either they propose new, yet to be discovered, particles or modifications to the Standard Model. So far, all attempts to prove that Dark Matter exists have failed. With the lack of supporting experimental results for any existing Dark Matter theories, it is time to examine other solutions that might explain Dark Matter without requiring any new particles to be detected. A different solution to the galaxy rotation problem would be to assume there is some external force pressing in on the galaxies holding them together. This research shows how external forces on the galaxies can duplicate the galaxy rotation curves that have been observed, without any Dark Matter. It also explains the acceleration constant a0 from the Modified Newtonian Dynamics (MOND) theory. The results show that a model using an external galactic force is a valid approach to explain Dark Matter.

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Section: Adding Antimatter Atoms To the Concordance Modelmentioning

confidence: 99%

Section: Adding Antimatter Atoms To the Concordance Modelmentioning

confidence: 99%

Cancelled: Using External Galactic Forces as an Alternative to Dark Matter

Neal¹

2022

Redefining Standard Model Particle Physics [Cancelled Title]

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“…Quite a lot of baryogenesis models have been produced over the last decades (reviews [4] - [9]). One scenario ( [1], [10] - [12]) is the baryon asymmetry to be produced by heavy particles decay in an expanding universe, with C and CP symmetry broken.…”

Section: Introductionmentioning

confidence: 99%

Electroweak baryogenesis by primordial black holes in Brans-Dicke modified gravity

Aliferis,

Zarikas

2020

Preprint

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A successful baryogenesis mechanism is proposed in the cosmological framework of Brans-Dicke modified gravity. Primordial black holes with small mass are produced at the end of the Brans-Dicke field domination era. The Hawking radiation reheats a spherical region around every black hole to a high temperature and the electroweak symmetry is restored there. A domain wall is formed separating the region with the symmetric vacuum from the asymmetric region where electroweak baryogenesis takes place. First order phase transition is not needed. In Brans-Dicke cosmologies black hole accretion can be strong enough to lead to black holes domination which extends the lifetime of black holes and therefore baryogenesis. The analysis of the whole scenario, finally, results in the observed baryon number which can be achieved for a CP-violation angle that is predicted by observationally accepted Two-Higgs Doublet Models. The advantage of our proposed scenario is that naturally provides both black hole domination and more efficient baryogenesis for smaller CP violating angles compared to the same mechanism applied in a FRW cosmological background.

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“…Various interesting models of baryogenesis have been proposed during the last thirty years (see reviews [1][2][3][4][5][6]). An important piece of knowledge extracted from all this research is the realization that it has proved quite difficult to construct a simple model capable of generating the observed amount of baryon asymmetry.…”

Section: Introductionmentioning

confidence: 99%

Efficient electroweak baryogenesis by black holes

2015

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A novel cosmological scenario, capable to generate the observed baryon number at the electroweak scale for very small CP violating angles, is presented. The proposed mechanism can be applied in conventional FRW cosmology, but becomes extremely efficient due to accretion in the context of early cosmic expansion with high energy modifications. Assuming that our universe is a Randall-Sundrum brane, baryon asymmetry can easily be produced by Hawking radiation of very small primordial black holes. The Hawking radiation reheats a spherical region around every black hole to a high temperature and the electroweak symmetry is restored there. A domain wall is formed separating the region with the symmetric vacuum from the asymmetric region where electroweak baryogenesis takes place. First order phase transition is not needed. The black holes's lifetime is prolonged due to accretion, resulting to strong efficiency of the baryon producing mechanism. The allowed by the mechanism black hole mass range includes masses that are energetically favoured to be produced from interactions around the higher dimensional Planck scale.Comment: 32 pages, to appear in Physical Review

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Baryogenesis and Cosmological Antimatter

Abstract: Possible mechanisms of baryogenesis are reviewed. Special attention is payed to those which allow for creation of astronomically significant domains or objects consisting of antimatter. Observational manifestations of cosmological antimatter are discussed.

Cited by 6 publications

References 41 publications

Cancelled: Using External Galactic Forces as an Alternative to Dark Matter

Cancelled: Using External Galactic Forces as an Alternative to Dark Matter

Electroweak baryogenesis by primordial black holes in Brans-Dicke modified gravity

Efficient electroweak baryogenesis by black holes

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