Ultra high energy cosmic ray, superheavy dark matter and extra dimension
نویسندگان
چکیده
منابع مشابه
Ultra-high energy cosmic rays from annihilation of superheavy dark matter
We consider the possibility that ultra-high energy cosmic rays originate from the annihilation of relic superheavy darkmatter.We find that a cross section of 〈σAv〉 ∼ 10cm(MX/10 GeV)3/2 is required to account for the observed rate of super-GZK events if the superheavy dark matter follows a Navarro–Frenk–White density profile. This would require extremely large-l contributions to the annihilation...
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The decay of very heavy metastable relics of the Early Universe can produce ultrahigh energy cosmic rays (UHECRs) in the halo of our own Galaxy. On distance scales of the order of the halo size, energy losses are negligible—no Greisen-ZatsepinKuzmin cutoff is expected. In this letter we show that, as a consequence of the hierarchical build up of the halo, this scenario predicts the existence of...
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Decaying superheavy particles can be produced by Topological Defects or, in case they are quasistable, as relics from the early Universe. The decays of these particles can be the sources of observed Ultra High Energy Cosmic Rays (E ∼ 10 − 10 GeV ). The Topological Defects as the UHE CR sources are critically reviewed and cosmic necklaces and monopole-antiminopole pairs are identified as most pl...
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Cryptons, metastable bound states of matter in the string hidden sector, with dynamically determined masses MX ∼ 10 12 GeV and lifetimes τX > ∼ 10 yr, may be generated, through inflation, with an abundance close to that required for a near-critical universe. Their decay debris may be responsible for the most energetic particles striking Earth’s atmosphere. Recent developments of this astonishin...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2001
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(01)01021-8