Plasma wakefield acceleration for ultrahigh-energy cosmic rays

被引:100
作者
Chen, PS [1 ]
Tajima, T
Takahashi, Y
机构
[1] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA
[2] Adv Photon Res Ctr, Japan Atom Energy Res Inst, Kyoto 6190215, Japan
[3] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA
关键词
D O I
10.1103/PhysRevLett.89.161101
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A cosmic acceleration mechanism is introduced which is based on the wakefields excited by the Alfven shocks in a relativistically flowing plasma. We show that there exists a threshold condition for transparency below which the accelerating particle is collision-free and suffers little energy loss in the plasma medium. The stochastic encounters of the random accelerating-decelerating phases results in a power-law energy spectrum: f(epsilon)proportional to1/epsilon(2). As an example, we discuss the possible production in the atmosphere of gamma ray bursts of ultrahigh-energy cosmic rays (UHECR) exceeding the Greisen-Zatsepin-Kuzmin cutoff. The estimated event rate in our model agrees with that from UHECR observations.
引用
收藏
页码:1 / 161101
页数:4
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