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IMPROVED FOKKER-PLANCK EQUATION FOR RESONANCE-LINE SCATTERING

机译:用于共振线散射的改进的Fokker-Planck方程

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A new Fokker-Planck equation is developed for treating resonance-line scattering, which is especially relevant to the treatment of Lyα in the early universe. It is a "corrected" form of the equation of Rybicki & Dell'Antonio that now obeys detailed balance, so the approach to thermal equilibrium is properly described. The new equation takes into account the energy changes due to scattering off moving particles, the recoil term of Basko, and stimulated scattering. One result is a surprising unification of the equation for resonance-line scattering and the Kompaneets equation. An improved energy exchange formula due to resonance-line scattering is derived. This formula is compared to previous formulas of Madau and coworkers and Chen & Miralda-Escude.
机译:建立了一个新的Fokker-Planck方程来处理共振线散射,这与早期宇宙中Lyα的处理特别相关。这是Rybicki&Dell'Antonio方程式的“校正”形式,现在可以满足详细的平衡要求,因此可以正确描述热平衡方法。新的方程式考虑到了由于运动粒子的散射,巴斯科的后坐力和受激散射引起的能量变化。一个结果是共振线散射方程和Kompaneets方程的令人惊讶的统一。推导了由于共振线散射而产生的改进的能量交换公式。将该公式与Madau和同事以及Chen&Miralda-Escude的先前公式进行比较。

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