New physics from ultrahigh energy cosmic rays
نویسنده
چکیده
Observations of cosmic rays with energies above ∼ 4 × 10 GeV have inspired several speculative suggestions concerning their origin. The crucial question is whether or not the spectrum exhibits the expected ‘GZK cutoff’ at this energy — concerning which there are presently contradictory results. If there is indeed a cutoff, then the sources are cosmologically distant and rather exotic in nature. If there is no cutoff then new physics is required.
منابع مشابه
Ultrahigh Energy Cosmic Rays: Old Physics or New Physics?
We consider the advantages of and the problems associated with hypotheses to explain the origin of ultrahigh energy cosmic rays (UHECR: E > 10 EeV) and the “trans-GZK” cosmic rays (TGZK: E > 100 EeV) both through (‘old physics” (acceleration in cosmic sources) and “new physics” (new particles, topological defects, fat neutrino cross sections, Lorentz invariance violation).
متن کاملX iv : a st ro - p h / 04 07 31 1 v 1 1 5 Ju l 2 00 4 Ultrahigh Energy Cosmic Rays : Old Physics or New Physics ?
We consider the advantages of and the problems associated with hypotheses to explain the origin of ultrahigh energy cosmic rays (UHECR: E > 10 EeV) and the " trans-GZK " cosmic rays (TGZK: E > 100 EeV) both through " old physics " (acceleration in cosmic sources) and " new physics " (new particles, topological defects, fat neutrino cross sections, Lorentz invariance violation).
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