Antistars as possible sources of antihelium cosmic rays

Bykov, A. M.; Постнов, К. А.; Bondar, A.; Блинников, С. И.; Dolgov, A.D.

doi:10.1088/1475-7516/2023/08/027

Cited by 5 publications

(3 citation statements)

References 106 publications

(155 reference statements)

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“…Possible observation of the unexpectedly high flux of antinuclei [101,102] and antistars in the Galaxy [103] strongly supports this hypothesis, in particular, by ref. [104], where it is advocated that antihelium cosmic rays are created by antistars.…”

Section: Addolgovmentioning

confidence: 99%

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JWST data and possible interpretation

Dolgov

2024

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources XIV — PoS(MULTIF2023)

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Recent data released by James Webb Space Telescope (JWST) and, somewhat earlier, the data presented by Hubble Space Telescope (HST) are commonly understood as a strong indication for breaking of the canonical ΛCDM cosmology. It is argued in the presented work that massive primordial black holes (PBH) could seed galaxy and quasar formation in the very young universe as it has been conjectured in our paper of 1993 and resolve the tension induced by the JWST and the HST data with the standard cosmology. This point of view is presently supported by several recent works. The proposed mechanism of PBH formation leads to the log-normal mass spectrum of PBHs and predicts abundant antimatter population of our Galaxy, Milky Way. Both these predictions are in excellent agreement with astronomical observations.

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Section: Addolgovmentioning

confidence: 99%

“…Connection between antistars and the observed fluxes of antinuclei was studied in recent paper [104]. 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.…”

Section: Pos(multif2023)010mentioning

confidence: 99%

JWST data and possible interpretation

Dolgov

2024

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources XIV — PoS(MULTIF2023)

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“…A possibility that antinuclei can be emitted from a population of antistats in the Galaxy is suggested in ref. [52]. 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.…”

Section: Antihelium and Antistarsmentioning

confidence: 99%

Lifting the tension of HST and JWST data with conventional cosmology by PBHs

Dolgov

2024

Proceedings of International Conference on Particle Physics and Cosmology — PoS(ICPPCRubakov2023)

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Fireball antinucleosynthesis

Fedderke,

Kaplan,

Mathur

et al. 2024

Phys. Rev. D

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The tentative identification of approximately ten relativistic antihelium (He¯) cosmic-ray events at AMS-02 would, if confirmed, challenge our understanding of the astrophysical synthesis of heavy antinuclei. We propose a novel scenario for the enhanced production of such antinuclei that is triggered by isolated, catastrophic injections of large quantities of energetic Standard Model (SM) antiquarks in our galaxy by physics beyond the Standard Model (BSM). We demonstrate that SM antinucleosynthetic processes that occur in the resulting rapidly expanding, thermalized fireballs of SM plasma can, for a reasonable range of parameters, produce the reported tentative ∼2:1 ratio of He¯3 to He¯4 events at AMS-02, as well as their relativistic boosts. Moreover, we show that this can be achieved without violating antideuterium or antiproton flux constraints for the appropriate antihelium fluxes. A plausible BSM paradigm for the catastrophic injections is the collision of macroscopic composite dark-matter objects carrying large net antibaryon number. Such a scenario would require these objects to be cosmologically stable, but to destabilize upon collision, promptly releasing a fraction of their mass energy into SM antiparticles within a tiny volume. We show that, in principle, the injection rate needed to attain the necessary antihelium fluxes and the energetic conditions required to seed the fireballs appear possible to obtain in such a paradigm. We leave open the question of constructing a BSM particle physics model to realize this, but we suggest two concrete scenarios as promising targets for further investigation. Published by the American Physical Society 2024

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Antistars as possible sources of antihelium cosmic rays

Cited by 5 publications

References 106 publications

JWST data and possible interpretation

JWST data and possible interpretation

Lifting the tension of HST and JWST data with conventional cosmology by PBHs

Fireball antinucleosynthesis

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