منابع مشابه
Ultra High Energy Cosmic Rays
The current status of Ultra High Energy Cosmic Rays (UHECR) is reviewed, with emphasis given to theoretical interpretation of the observed events. The galactic and extragalactic origin, in case of astrophysical sources of UHE particles, have the problems either with acceleration to the observed energies or with the fluxes and spectra. Topological defects can naturally produce particles with ene...
متن کاملUltra High Energy Neutrino Astronomy
With Baikal and AMANDA detectors UHE neutrino astronomy entered its first stage, which will reach the decisive level with 1 km detector. Simultaneously, the first steps are made in building the detectors searching for superGZK neutrinos, i.e. those with energies above the GZK cutoff, EGZK ∼ 5 × 10 19 eV. Radio-telescopes, such as RICE, GLUE and FORTE are already searching for radio signal from ...
متن کاملUltra High Energy Cosmic Rays
The origin of the particles in the highest energy end of the cosmic ray spectrum is discussed in the context of the wider problem of the origin of the whole cosmic radiation as observed at the Earth. In particular we focus our attention on the acceleration problem and on the transition from galactic to extragalactic cosmic rays.
متن کاملUltra High Energy Cosmic Rays
We discuss theoretical issues and experimental data that brought the ultra high energy cosmic rays in the list of Nature’s greatest puzzles. After many years of research we still do not know how astrophysical acceleration processes can reach energies exceeding 10 GeV. The main alternative top-down mechanism postulates the existence of super massive X-particles that create a particle spectrum ex...
متن کاملUltra high energy neutrinos: the key to ultra high energy cosmic rays
We discuss the relation between the acceleration spectra of extragalactic cosmic ray protons and the luminosity and cosmological evolution of their sources and the production of ultra high energy cosmogenic neutrinos in their propagation from the sources to us.
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1998
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(98)00068-9