2,137 research outputs found
Correlation of the HIghest Energy Cosmic Rays with the Supergalactic Plane
We examine the anisotropy of the arrival directions of twenty seven ultra
high energy cosmic rays detected by the Pierre Auger Collaboration. We confirm
the anisotropy of the arrival directions of these events and find a significant
correlation with the updated definition of the supergalactic plane at distances
up to 70 Mpc, A Monte Carlo calculation of isotropic source distribution
suggests a chance probability for isotropic event arrival direction
distribution of 2-6.Comment: 3 pages, 2 postscript figures. Revised version has a different title
and extended discussion of the corrlations with different astrophysical
object
Ultra 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.Comment: 12 pages, 5 figures, Talk presented at the Vulcano06 workshop. Second
version with some typos remove
The beginning of cosmic ray astronomy
We discuss the anisotropic arrival directions of the ultra high energy cosmic
rays detected by Auger which I consider one of the biggest discoverie in
astrophysics during the last year.Comment: 5 pages, 2 figures, Concluding remarks at the Vulcano2008 worksho
Status, performance, and first results of the IceTop array
We describe the design and performance of IceTop, the air shower array on top
of the IceCube neutrino detector. After the 2008/09 antarctic summer season
both detectors are deployed at almost 3/4 of their design size. With the
current IceTop 59 stations we can start the study of showers of energy well
above 10 eV. The paper also describes the first results from IceTop and
our plans to study the cosmic ray composition using several different types of
analysis.Comment: ^ pages, 6 figures, submitted to the Proceedings of the International
Symposium on Very High Energy Cosmic Ray Interactions, Paris, 200
Ultra high energy cosmic rays: A review
We present the main results on the energy spectrum and composition of the
highest energy cosmic rays of energy exceeding 10 eV obtained by the
High Resolution Fly's Eye and the Southern Auger Observatory. The current
results are somewhat contradictory and raise interesting questions about the
origin and character of these particles.Comment: 12 pages, 6 figures, presented at the 2010 Vulcano workshop, Vulcano,
Ital
Time-reversal symmetry breaking state in dirty three-band superconductor
I study the effects of disorder on the superconductivity of a three-band
model with repulsive interband pairing. Such a model can support several
possible superconducting order parameters, including a complex time-reversal
symmetry breaking (TRSB) state. Impurity scattering suppresses the critical
temperature of all these states, but the complex state survives, and remains a
part of the phase diagram of the model even in the presence of moderate amount
of disorder. This means that the TRSB states could be experimentally accessible
in multiband materials like iron pnictides and chalcogenides.Comment: 7 pages, 6 figures, invited paper in Focus on Multicomponent
Superconductivity, special issue of Superconductor Science and Technolog
The transition from galactic to extragalactic cosmic rays
We discuss the region of transition between galactic and extragalactic cosmic
rays. The exact shapes and compositions of these two components contains
information about important parameters of powerful astrophysical sources and
the conditions in extragalactic space. Several types of experimental data,
including the exact shape of the ultrahigh energy cosmic rays, their chemical
composition and their anisotropy, and the fluxes of cosmogenic neutrinos have
to be included in the solution of this problem.Comment: 6 pages, 3 figures, written in LaTeX, to be published in the
Proceedings of the NOW 2006 worksho
Ultra high energy cosmic rays and neutrinos after Auger
We discuss the main results that were recently published by the Auger
Collaboration and their impact on our knowledge of the ultra high energy cosmic
rays and neutrinos.Comment: 12 pages, 4 figures, Talk at the Vulcano 2008 meeting "Frontier
objects in astrophysics and particle physics", Vulcano, Ital
The IceTop experiment in 2010
We present the current status of the IceTop air shower array on top of the
IceCube neutrino detector that IceTop can use as a huge detector of TeV muons.
We laos give a brief discussion of different types of air shower events that
contain information on the spectrum and composition of the cosmic rays in a
wide energy range.Comment: 6 pages, 2 figures, presented at the Vulcano 2010 workshop, Vulcano,
Ital
Atmospheric neutrino challenges
We briefly review the improvements in the predictions of atmospheric neutrino
fluxes since the NOW2000 workshop. In spite of the great progress in
calculational technique the predictions are still not exact because of the
uncertainties in the two major sets of input - cosmic ray flux and hadronic
interactions on light nuclei.Comment: 6 pages, 7 postscript figures, prepared for the NOW 2004 Proceeding
- âŠ