Cosmic Ray Antihelium Probe for the Origin of the Baryonic Matter in the Universe

Golubkov, Vladislav S.; Khlopov, Maxim Yu.; Kirichenko, A.O.; Kravtsova, Alexandra; Mayorov, A. G.; Yulbarisov, R. F.

doi:10.3390/sym14091953

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…In this paper, we consider possible explanations of the tentative detection of antihelium nuclei by a population of Galactic or extragalactic antistars. Astrophysical constraints on the properties of possible Galactic antistar population have been discussed earlier [8,12,[18][19][20][21][22]. In section 2 we briefly discuss a non-standard nucleosynthesis in the early Universe at large baryon-to-photon ratios |η| 10 −9 .…”

Section: Introductionmentioning

confidence: 99%

Antistars as possible sources of antihelium cosmic rays

Bykov

Постнов

Bondar

et al. 2023

J. Cosmol. Astropart. Phys.

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A minor population of antistars in galaxies has been predicted by some of non-standard models of baryogenesis and nucleosynthesis in the early Universe, and their presence is not yet excluded by the currently available observations. Detection of an unusually high abundance of antinuclei in cosmic rays can probe the baryogenesis scenarios in the early Universe. Recent report of the AMS-02 collaboration on the tentative detection of a few antihelium nuclei in GeV cosmic rays provided a great hope on the progress in this issue. We discuss possible sources of antinuclei in cosmic rays from antistars which are predicted in a modified Affleck-Dine baryogenesis scenario by Dolgov and Silk (1993). The model allows us to estimate the expected fluxes and isotopic content of antinuclei in the GeV cosmic rays produced in scenarios involving antistars. We show that the flux of antihelium CRs reported by the AMS-02 experiment can be explained by Galactic anti-nova outbursts, thermonuclear anti-SN Ia explosions, a collection of flaring antistars, or an extragalactic source with abundances not violating existing gamma-ray and microlensing constraints on the antistar population.

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Section: Introductionmentioning

confidence: 99%

Antistars as possible sources of antihelium cosmic rays

Bykov

Постнов

Bondar

et al. 2023

J. Cosmol. Astropart. Phys.

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“…The presence of antihelium component of cosmic rays at the level accessible to AMS02 experiment cannot be explained by natural astrophysical sources [1] and, if confirmed, can constitute evidence for the existence of primordial macroscopic antimatter objects in the Milky Way galaxy. The appearance of such objects in the baryon asymmetrical Universe would reflect strong nonhomogeneity of baryosynthesis and would shed light on the origin of baryonic matter in the Universe (see [2][3][4][5][6][7] for review and references).…”

Section: Introductionmentioning

confidence: 99%

The Formalism of Milky-Way Antimatter-Domains Evolution

Khlopov

Lecian

2023

Galaxies

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If baryosynthesis is strongly nonhomogeneous, macroscopic regions with antibaryon excess can be created in the same process from which the baryonic matter is originated. This exotic possibility can become real, if the hints to the existence of antihelium component in cosmic rays are confirmed in the AMS02 experiment, indicating the existence of primordial antimatter objects in our Galaxy. Possible forms of such objects depend on the parameters of models of baryosynthesis and evolution of antimatter domains. We elaborate the formalism of analysis of evolution of antibaryon domain with the account for baryon-antibaryon annihilation at the domain borders and possible “Swiss cheese” structure of the domain structure. We pay special attention to evolution of various forms of high, very high and ultrahigh density antibaryon domains and deduce equations of their evolution in the expanding Universe. The proposed formalism will provide the creation of evolutionary scenarios, linking the possible forms and properties of antimatter bodies in our Galaxy to the mechanisms of nonhomogeneous baryosynthesis.

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Cosmic Ray Antihelium Probe for the Origin of the Baryonic Matter in the Universe

Cited by 2 publications

References 25 publications

Antistars as possible sources of antihelium cosmic rays

Antistars as possible sources of antihelium cosmic rays

The Formalism of Milky-Way Antimatter-Domains Evolution

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