天体物理等离子体中的双康普顿过程
The double Compton process in astrophysical plasmas
摘要:
我们研究了双康普顿(DC)过程的粒子能量范围很广,以前的治疗远远超出了软光子的限制,采用数值和分析方法。这使我们能够调查的DC过程的物理学高度相关的相对论制度的电磁粒子级联在早期宇宙和光子占主导地位的天体物理等离子体。得到了软光子极限下直流发射率的广义精确解析表达式。这些比较现有的近似,第一次研究超相对论制度。我们还数值积分的完整的DC碰撞项计算在一般粒子能量的DC发射率。仔细处理直流红外发散天体物理等离子体内,包括受激直流发射的存在相关的微妙影响,进行了讨论。所得到的结果可以有效地表示使用代码DCpack,这也允许一个计算平均发射率一般入射电子和光子分布。这使得天体物理等离子体内部的直流过程的建模有了坚实的基础,特别是在早期宇宙的宇宙热化问题的计算中应该会找到应用。
英文摘要:
We study the double Compton (DC) process for a wide range of particle energies, extending previous treatments well beyond the soft photon limit, employing both numerical and analytical methods. This allows us to investigate the physics of the DC process up to the highly relativistic regime relevant to electromagnetic particle cascades in the early Universe and photon-dominated astrophysical plasmas. Generalized exact analytic expressions for the DC emissivity in the soft photon limit are obtained. These are compared to existing approximations, for the first time studying the ultra-relativistic regime. We also numerically integrate the full DC collision term calculating the DC emissivity at general particle energies. A careful treatment of DC infrared divergences inside astrophysical plasmas, including subtle effects related to the presence of stimulated DC emission, is discussed. The obtained results can be efficiently represented using the code DCpack, which also allows one to compute average emissivities for general incoming electron and photon distributions. This puts the modelling of the DC process inside astrophysical plasmas on a solid footing and should find applications in particular for computations of the cosmological thermalization problem in the early Universe.
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