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arXiv 1409.7201gr-qc
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Schwarzschild黑洞散射Dirac费米子的分波分析

Partial wave analysis of the Dirac fermions scattered from Schwarzschild black holes

Ion I. Cotaescu, Cosmin Crucean, Ciprian A. Sporea

摘要:

利用Dirac方程的渐近解析解,给出了Schwarzschild图和Cartesian规范中连续能谱的散射模,建立了Dirac费米子被黑洞散射的分波分析.束缚态的吸收和可能的共振散射的贡献被忽略,因为有关的离散谱,是迄今研究较少的一些技术困难。在此框架下,导出了散射角、黑洞质量、费米子能量和质量对微分截面和诱导极化度的解析表达式。此外,由于散射模式的吸收截面的封闭形式推导表明,在高能量极限,这往往是事件视界面积与费米子质量(包括零)。图形研究呈现了分析前向/后向散射(也称为荣耀散射)和作为散射角的函数的偏振度的微分截面。图形分析显示了散射强度在前向/后向方向上的振荡,这种现象称为螺旋散射。微分截面的能量依赖性也建立通过使用解析和图形的方法。

英文摘要:

Asymptotic analytic solutions of the Dirac equation, giving the scattering modes (of the continuous energy spectrum, $E>mc^2$) in Schwarzschild's chart and Cartesian gauge, are used for building the partial wave analysis of Dirac fermions scattered by black holes. The contribution of the bound states to absorption and possible resonant scattering is neglected because of some technical difficulties related to the discrete spectrum that is less studied so far. In this framework, the analytic expressions of the differential cross section and induced polarization degree are derived in terms of scattering angle, mass of the black hole, energy and mass of the fermion. Moreover, the closed form of the absorption cross section due to the scattering modes is derived showing that in the high-energy limit this tends to the event horizon area regardless of the fermion mass (including zero). A graphical study presents the differential cross section analyzing the forward/backward scattering (known also as glory scattering) and the polarization degree as functions of scattering angle. The graphical analysis shows the presence of oscillations in scattering intensity around forward/backward directions, phenomena known as spiral scattering. The energy dependence of the differential cross section is also established by using analytical and graphical methods.

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