Dark cosmic rays
نویسندگان
چکیده
منابع مشابه
24 . Cosmic rays 1 24 . COSMIC RAYS
The cosmic radiation incident at the top of the terrestrial atmosphere includes all stable charged particles and nuclei with lifetimes of order 106 years or longer. Technically, “primary” cosmic rays are those particles accelerated at astrophysical sources and “secondaries” are those particles produced in interaction of the primaries with interstellar gas. Thus electrons, protons and helium, as...
متن کاملHalo Dark Matter and Ultra-High Energy Cosmic Rays
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...
متن کاملProbing the Cosmic Dark Age in X–rays
Empirical studies of the first generation of stars and quasars will likely become feasible within the next decade in several different wavelength bands. Microwave anisotropy experiments, such as MAP or Planck, will set constraints on the ionization history of the intergalactic medium due to these sources. In the infrared, the Next Generation Space Telescope (NGST) will directly detect sub–galac...
متن کاملHigh Energy Cosmic Rays from Decaying Supersymmetric Dark Matter
Motivated by the recent PAMELA and ATIC results, we calculate the electron and positron fluxes from the decay of lightest-superparticle (LSP) dark matter. We assume that the LSP is the dominant component of dark matter, and consider the case that the R-parity is very weakly violated so that the lifetime of the LSP becomes of the order of 1026 sec. We will see that, with such a choice of the lif...
متن کاملCosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing
If interpreted in terms of decaying dark matter, the steep rise in the positron fraction of cosmic rays above 10GeV, as observed by the PAMELA experiment, suggests an underlying production mechanism that favors leptonic channels. We consider a scenario where a portion of the dark matter is made of the gauginos of an unbroken hidden-sector U(1)X , which interact with the visible sector only thro...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters B
سال: 2017
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2017.02.035