Ultra High Energy (UHE) neutrino Astronomy and relic Neutrino masses may play a key role in solving the Ultra High Energy Cosmic Ray (UHECR) puzzle within the Z-Showering model. Tau air-shower originated by UHE neutrino in matter may probe and amplify this expected UHE neutrino Astronomy. The discover of upcoming and horizontal τ air-showers (UPTAUs, HORTAUs), born by UHE, ντ interacting inside...

Scattering processes in the cosmic microwave background limit the propagation of ultra high energy charged particles in our Universe. For extragalactic proton sources resonant photopion production results in the famous Greisen-Zatsepin-Kuzmin (GZK) cutoff at about 4×10 GeV expected in the spectrum observed on Earth. The faint flux of ultra high energy cosmic rays of less than one event per year...

The origin of the highest energy cosmic rays is one of the most exciting questions of astroparticle physics. Even though a general concept linking magnetic field and size of possible sources (the so called “Hillas plot” [1]) is the basis of our current understanding, up to now there are no generally accepted source candidates known to be able to produce particles of such extreme energies. At th...

The detection of the GZK feature in the cosmic ray spectrum, resulting from the production of pions by ultra-high energy protons scattering off the cosmic microwave background (CMB), can shed light on the mysterious sources of these high energy particles. Using numerical simulations we developed for the propagation of Ultra High Energy Cosmic Rays (UHECR) in the CMB we determine the statistical...

We study the effect of random extra-galactic magnetic fields on the propagation of protons of energy larger than 10 eV. We show that for reasonable field values (in the 100 nG range) the transition between diffusive and ballistic regimes occurs in the same energy range as the GZK cutoff (a few 10 eV). The usual interpretation of the flux reduction above the GZK energy in terms of a sudden reduc...

The article presents the results of studying pharmacokinetics and enzymatic stability a new pharmacologically active compound GZK-111– N-phenylacetyl-glycyl-L-proline ethyl ether in comparison with noopept – N-phenylacetyl-L-prolyl-glycine rats. It has been shown that both compounds are intensively metabolized body experimental animals, while one main metabolites is cyclo-L-prolylglycine (CPG),...

The observation of cosmic–ray events above the Greisen–Kuzmin–Zatsepin (GZK) cutoff of EGZK ∼ 5×1019 eV challenges orthodox modeling. We discuss a possible solution which uses standard hot Big Bang cosmology and Standard Model (SM) particle physics augmented only by < ∼ eV neutrino masses as suggested by solar, atmospheric, and terrestrial neutrino detection. In this scheme, cosmic ray neutrino...

Neutrinos from far away sources annihilating at the Z resonance on relic neutrinos may give origin to the ultrahigh-energy cosmic rays. Here we present predictions of this mechanism with relic neutrinos lighter than 1 eV, which do not gravitationally cluster. We show that not only the super GZK events, but the “ankle” and all events above it can be accounted for. Most primaries above the ankle ...

The spectrum of extra-galactic cosmic rays (CRs) is expected to follow the GreisenZatsepin-Kuzmin (GZK) cutoff at about 5× 10 GeV which results from energy losses of charged nuclei in the cosmic microwave background. So far the confrontation of this feature with CR data is inconclusive. In the absence of close-by sources a power-law continuation of the spectrum might signal the contribution of ...