Annihilations of superheavy dark matter in superdense clumps
| Autor: | M. Kachelrieß, Vyacheslav Dokuchaev, Yu. N. Eroshenko, M. Aa. Solberg, V. S. Berezinsky |
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| Rok vydání: | 2010 |
| Předmět: |
Physics
Nuclear and High Energy Physics Particle physics Annihilation Cosmology and Nongalactic Astrophysics (astro-ph.CO) Electroweak interaction Dark matter High Energy Physics::Phenomenology Superpartner FOS: Physical sciences Supersymmetry Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies Astrophysics of Galaxies (astro-ph.GA) Neutralino Higgsino Electroweak scale Astrophysics::Galaxy Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.1002.3445 |
| Popis: | Superheavy dark matter (SHDM) exchanges energy with its environment much slower than particles with masses close to the electroweak (EW) scale and has therefore different small-scale clustering properties. Using the neutralino as candidate for the SHDM, we find that free-streaming allows the formation of DM clumps of all masses down to $\sim 260 m_\chi$ in the case of bino. If small-scale clumps evolve from a non-standard, spiky spectrum of perturbations, DM clumps may form during the radiation dominated era. These clumps are not destroyed by tidal interactions and can be extremely dense. In the case of a bino, a "gravithermal catastrophe" can develop in the central part of the most dense clumps, increasing further the central density and thus the annihilation signal. In the case of a higgsino, the annihilation signal is enhanced by the Sommerfeld effect. As a result annihilations of superheavy neutralinos in dense clumps may lead to observable fluxes of annihilation products in the form of ultrahigh energy particles, for both cases, higgsinos and binos, as lightest supersymmetric particles. Comment: 9 pages, 2 eps figures; v2: changed title, to appear in PRD |
| Databáze: | OpenAIRE |
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