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Conference Papers Acta Physica Polonica B Year : 2004

Some Current Theoretical Issues around Ultra-High Energy Cosmic Rays

Abstract

We address some current theoretical issues around ultra-high energy cosmic rays. We recall that scenarios producing more gamma-rays than cosmic rays up to high redshift can in general only provide a sub-dominant contribution to the ultra-high energy cosmic ray flux. This includes extra-galactic top-down and the Z-burst scenarios. Finally we discuss the influence of large scale cosmic magnetic fields on ultra-high energy cosmic ray propagation which is currently hard to quantify. The views presented here represent the authors perspective.

Dates and versions

in2p3-00086587 , version 1 (19-07-2006)

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G. Sigl. Some Current Theoretical Issues around Ultra-High Energy Cosmic Rays. 2004 Cracow Epiphany Conference on Astroparticle Physics, Jan 2004, Cracow, Poland. pp.1845-1862. ⟨in2p3-00086587⟩
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