. hi st - p h ] 1 4 M ay 2 00 9 Bhabha ’ s Contributions to Elementary Particle Physics and Cosmic Rays Research
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ar X iv : h ep - p h / 04 05 16 8 v 1 1 8 M ay 2 00 4 ASTROPARTICLE PHYSICS
In this astro-particle lecture course I shall try to emphasize evidence of the new physics which we have in cosmological and astrophysical data. This includes support of the inflationary model, necessity of dark energy and of non-baryonic dark matter, the Grizen-Zatsepin-Kuzmin puzzle of the ultra-high energy cosmic rays.
متن کاملiv : a st ro - p h / 02 05 40 8 v 1 2 3 M ay 2 00 2 High - energy Neutrinos from the Cosmic Accelerator RX J 1713
The observation of TeV-gamma rays of π 0 origin from the supernova remnant RX J1713.7-3946 has revealed the first specific site where protons are accelerated to energies typical of the main component of the cosmic rays. In this letter we calculate the high-energy neutrino flux associated with this source to be at least 40 muon-type neutrinos per kilometer-squared per year. We perform the same c...
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).
متن کاملar X iv : a st ro - p h / 05 01 13 3 v 2 2 7 M ay 2 00 5 1 Ultrahigh energy cosmic rays from collisional annihilation revisited
We re-examine collisional annihilation of superheavy dark matter particles in dark matter density spikes in the galactic halo as a possible source of ultrahigh energy cosmic rays. We estimate the possible flux in a way that does not depend on detailed assumptions about the density profiles of dark matter clumps. The result confirms that collisional annihilation is compatible with annihilation c...
متن کاملar X iv : h ep - p h / 01 05 34 8 v 1 3 1 M ay 2 00 1 Ultrahigh energy cosmic rays as a Grand Unification signal
We analyze the spectrum of the ultrahigh energy (above ≈ 10 9 GeV) cosmic rays. With a maximum likelihood analysis we show that the observed spectrum is consistent with the decay of extragalactic GUT scale particles. The predicted mass for these superheavy particles is m X = 10 b GeV, where b = 14.6
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