致密恒星物质中等离子体截止和辐射跃迁的增强
Plasma cutoff and enhancement of radiative transitions in dense stellar matter
摘要：
我们研究了等离子体对辐射跃迁的影响（例如，原子或原子核的激发态的衰变）在过渡频率$ω\lesssim ω_p$（其中$ω_p$是电子等离子体频率）下的致密等离子体中。衰变通过四个通道-真正的横向和纵向等离子体激元的发射以及虚拟的横向和纵向等离子体激元的发射，随后由等离子体吸收等离子体激元。真实等离子体激元的发射在$ω\leq ω_p$处消失，但虚拟等离子体激元的过程强烈增强了辐射衰变。讨论了这些结果在白矮星核和中子星包层辐射过程中的应用。
英文摘要：
We study plasma effects on radiative transitions (e.g., decay of excited states of atoms or atomic nuclei) in a dense plasma at the transition frequencies $ω\lesssim ω_p$ (where $ω_p$ is the electron plasma frequency). The decay goes through four channels -- the emission of real transverse and longitudinal plasmons as well as the emission of virtual transverse and longitudinal plasmons with subsequent absorption of such plasmons by the plasma. The emission of real plasmons dies out at $ω\leq ω_p$, but the processes with virtual plasmons strongly enhance the radiative decay. Applications of these results to radiative processes in white dwarf cores and neutron star envelopes are discussed.
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