3,013 research outputs found
Gamma Ray Astronomy with Magnetized Zevatrons
Full text linkNearby sources of cosmic rays up to a ZeV(=10^21 eV) could be observed with a
multi-messenger approach including secondary gamma-rays and neutrinos. If
cosmic rays above ~10^18 eV are produced in magnetized environments such as
galaxy clusters, the flux of secondary gamma-rays below ~1 TeV can be enhanced
up to several orders of magnitudes compared to unmagnetized sources. A
particular source of enhancement are synchrotron and cascade photons from
e^+e^- pairs produced by protons from sources with relatively steep injection
spectra proportional to E^-2.6. Such sources should be visible at the same time
in ultra-high energy cosmic ray experiments and gamma-ray telescopes.Comment: 4 pages, 3 ps figure
Rapport fait au nom de la Commission paritaire sur les solutions susceptibles de favoriser la commercialisation au sein de la CEE, à des prix stables et rémunérateurs, des produits des Etats associés. = Report on behalf of the Joint Commission on solutions to improve marketing within the EEC, through stabilization of prices and remunerations, products of the Associated States. EEC/AASM Parliamentary Conference Working Documents, Document 20/67, 20 November 1967
Get PDFReport drawn up on behalf of the Legal Affairs Committee on the proposals from the Commission of the European Communities to the Council (Doc. 133/72) for I. a directive on the approximation of Member States' legislation on radio interference caused by domestic electrical appliances, portable power tools and similar devices II. a directive on the approximation of Member States' legislation on radio interference caused by fluorescent lighting tubes. EP Working Document, Document 1972-1973 340/72, 29 March 1973
Get PDFRapport fait au nom de la Commission des investissements, des questions financiéres et du dévelopment de la production sur la mission d'étude et d'information effectuée par la Commission du 14 au 19 janvier 1957 dans les régions périphériques de la République Fédérale d'Allemagne. = Report on behalf of the Committee on Investment about financial issues and production development developed by the Commmittee 14 to 19 January 1957 in the peripheral regions of the Federal Republic of Germany. Common Assembly: ordinary session, June 1957. 1956-1957 Doc. No. 33
Get PDFRapport fait au nom de la Commission des investissements, des questions financiéres et du développement de la production sur le probléme des prix du charbon et la proposition de résolution Doc. no 17 (1956-1957). Exercice 1956-1957 Session ordinaire (Seconde partie) = Report on behalf of the Investment Commission, financial issues and production development on coal prices and problem resolution. No. 17 (1956-1957). Common Assembly: Year 1956-1957; ordinary session [Second Part], June 1957. 1956-1957 Doc. No. 34
Get PDFMethods for searching UHECR anisotropies with the Pierre Auger Observatory
Get PDFThe Pierre Auger Observatory, currently under construction, is a detector of Ultra-Hight Energy Cosmic Rays (UHECR), which will allow to study the highest-energy particles with unprecedented statistics . The aim of this paper is to present methods wich are currently under development within the Auger Collaboration to study possible anisotropies of UHECR which are a major key to understand their origin
Lorentz Violation for Photons and Ultra-High Energy Cosmic Rays
Full text linkLorentz symmetry breaking at very high energies may lead to photon dispersion
relations of the form omega^2=k^2+xi_n k^2(k/M_Pl)^n with new terms suppressed
by a power n of the Planck mass M_Pl. We show that first and second order terms
of size xi_1 > 10^(-14) and xi_2 < -10^(-6), respectively, would lead to a
photon component in cosmic rays above 10^(19) eV that should already have been
detected, if corresponding terms for electrons and positrons are significantly
smaller. This suggests that Lorentz invariance breakings suppressed up to
second order in the Planck scale are unlikely to be phenomenologically viable
for photons.Comment: 4 revtex pages, 3 postscript figures included, version published in
PR
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