A new analytic solution for 2nd-order Fermi acceleration

被引：10
作者：
Mertsch, Philipp [1 ]
机构：
[1] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2011年 / 12期
关键词：
particle acceleration; cosmic ray theory; STOCHASTIC PARTICLE-ACCELERATION; COSMIC-RAY TRANSPORT; ELECTRON ACCELERATION; CHARGED PARTICLES; BLACK-HOLE; EMISSION; EVOLUTION; WAVES; REACCELERATION; TURBULENCE;
D O I：
10.1088/1475-7516/2011/12/010
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A new analytic solution for 2nd-order Fermi acceleration is presented. In particular, we consider time-dependent rates for stochastic acceleration, diffusive and convective escape as well as a diabatic losses. The power law index q of the turbulence spectrum is unconstrained and can therefore account for Kolmogorov (q - 5/3) and Kraichnan (q - 3/2) turbulence, Bohm diffusion (q = 1) as well as the hard-sphere approximation (q = 2). This considerably improves beyond solutions known to date and will prove a useful tool for more realistic modelling of 2nd-order Fermi acceleration in a variety of astrophysical environments.
引用
收藏
页数：14
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