稠密等离子体的韧致辐射和Landau-Pomeranchuk-Migdal效应
Bremsstrahlung from dense plasmas and the Landau-Pomeranchuk-Migdal effect
摘要：
由于发射电子的多次散射而导致的韧致辐射截面的抑制是致密介质中的重要效应（朗道-波默兰丘克-米格达尔效应）。在这里，我们研究了从一个密集的，完全电离和非相对论性的氢等离子体的发射。使用介电的方法，我们涉及的光学性质，如发射和吸收平衡力-力关联函数，这使得一个系统的微扰处理的帮助下，热力学格林函数。通过考虑自能和顶点修正，介质的修改，如多重散射的发射电子被考虑在内。结果提出的吸收系数作为在各种密度的频率的函数。结果表明，在低频高密度区，介质效应对逆韧致辐射的修正更为显著。
英文摘要：
The suppression of the bremsstrahlung cross section due to multiple scattering of the emitting electrons is an important effect in dense media (Landau-Pomeranchuk-Migdal effect). Here, we study the emission from a dense, fully-ionized and non-relativistic hydrogen plasma. Using the dielectric approach, we relate optical properties such as emission and absorption to equilibrium force-force correlation functions, which allow for a systematic perturbative treatment with the help of thermodynamic Green functions. By considering self-energy and vertex corrections, medium modifications such as multiple scattering of the emitting electrons are taken into account. Results are presented for the absorption coefficient as a function of the frequency at various densities. It is shown that the modification of the inverse bremsstrahlung due to medium effects becomes more significant in the low frequency and high density region.
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