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192 papers · 1 filter
Double Pair Production by Ultra High Energy Cosmic Ray Photons
S. V. Demidov, O. E. Kalashev
With use of CompHEP package we've made the detailed estimate of the influence of double e+e- pair production by photons (DPP) on the propagation of ultra high energy electromagneti…
Ultimate synchrotron cutoff in gamma-ray spectra of blazars as a signature of the converter mechanism
Boris E. Stern, Yana Y. Tikhomirov
There is a robust upper limit on the energy of synchrotron radiation in high-energy astrophysics: , where is the fine structure constant and the…
Constraints on amplitudes of curvature perturbations from primordial black holes
Edgar Bugaev, Peter Klimai
We calculate the primordial black hole (PBH) mass spectrum produced from a collapse of the primordial density fluctuations in the early Universe using, as an input, several theoret…
CMB anisotropy induced by tachyonic perturbations of dark energy
M. V. Libanov, V. A. Rubakov, O. S. Sazhina +1
We study effects of possible tachyonic perturbations of dark energy on the CMB temperature anisotropy. Motivated by some models of phantom energy, we consider both Lorentz-invarian…
Sensitivity of cosmic-ray experiments to ultra-high-energy photons: reconstruction of the spectrum and limits on the superheavy dark matter
O. E. Kalashev, G. I. Rubtsov, S. V. Troitsky
We estimate the sensitivity of various experiments detecting ultra-high-energy cosmic rays to primary photons with energies above 10^19 eV. We demonstrate that the energy of a prim…
Testing large-scale (an)isotropy of ultra-high energy cosmic rays
Hylke B. J. Koers, Peter Tinyakov
We present a simple yet powerful method to test models of cosmic-ray (CR) origin using the distribution of CR arrival directions. The method is statistically unambiguous in the sen…