Fast neutron–mirror neutron oscillation and ultra high energy cosmic rays
نویسندگان
چکیده
منابع مشابه
Neutron – Mirror Neutron Oscillation and Ultra High Energy Cosmic Rays
We discuss the phenomenological and astrophysical implications of neutron mirror neutron oscillation and show that the present experimental data allow an oscillation time in vacuum, τnn′ , much smaller than the neutron lifetime. Such a fast oscillation could provide a very efficient mechanism for transporting protons with super-GZK energies at very large distances provided that the CMB of mirro...
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If there exists the mirror world, a parallel hidden sector of particles with exactly the same microphysics as that of the observable particles, then the primordial nucleosynthesis constraints require that the temperature of the cosmic background of mirror relic photons should be smaller than that of the ordinary relic photons, T /T < 0.5 or so. On the other hand, the present experimental and as...
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The long-held notion that the highest energy cosmic rays are of distant extragalactic origin is challenged by observations that events above approximately 1020 eV do not exhibit the expected high-energy cutoff from photopion production off the cosmic microwave background. We suggest that these unexpected ultra-high-energy events are due to iron nuclei accelerated from young strongly magnetized ...
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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...
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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.
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2006
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2006.03.008