Some Current Theoretical Issues around Ultra-High Energy Cosmic Rays

Details Some Current Theoretical Issues around Ultra-High Energy Cosmic Rays Some Current Theoretical Issues around Ultra-High Energy Cosmic Rays

2004-04-03

arxiv.org/abs/astro-ph/0404074v1

Acta Phys.Polon. B35 (2004) 1845-1862

Astronomy and Astrophysics

Astrophysics

17 latex pages, 5 ps figures included, review given at the 2004 Cracow Epiphany Conference on Astroparticle Physics, to appear

Scientific paper

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.

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