Bochum 2015 – scientific programme

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P: Fachverband Plasmaphysik

P 10: Theory and Modelling I

P 10.4: Talk

Tuesday, March 3, 2015, 11:30–11:45, HZO 50

Plasma Effects on Extragalactic Ultra-high-energy Cosmic Ray Hadron Beams in Cosmic Voids — •Steffen Krakau and Reinhard Schlickeiser — Institut fur Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum

The linear instability of an ultrarelativistic hadron beam (Γ_b≈ 10⁶) in the unmagnetized intergalactic medium is investigated with respect to the excitation of collective electrostatic and aperiodic electromagnetic fluctuations. This analysis is important for the propagation of extragalactic ultrarelativistic cosmic rays (E>10¹⁵eV) from their distant sources to Earth. We calculate minimum instability growth times which are orders of magnitude shorter than the cosmic ray propagation time in the IGM. Due to nonlinear effects, especially the modulation instability, the cosmic ray beam stabilize and can propagate with nearly no energy loss through the intergalactic medium.