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arXiv 2002.07145hep-phhep-th
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高阶暗物质束缚态的形成:非平衡量子场论方法

Dark Matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

Tobias Binder, Burkhard Blobel, Julia Harz, Kyohei Mukaida

摘要:

在共湮灭的情况下,亚稳态暗物质束缚态的形成可以通过与各种标准模型浴粒子的散射有效地发生,其中在电弱交叉过程中的轻玻色子,甚至无质量的光子和胶子在t通道中交换。这些高阶过程的振幅,但是,发散的共线方向的进出浴粒子,如果介质是无质量的。为了解决共线发散问题,我们在非平衡量子场论的框架下导出了束缚态形成碰撞项。的主要结果是一个更一般的截面,它允许计算更高阶的束缚态形成过程内的原始等离子体背景在一个全面的方式表达。基于这一结果,我们表明,下一个领先的顺序的贡献,包括浴粒子散射,是i)共线有限和ii)一般占主导地位的壳层发射的温度大于结合能的绝对值。基于一个简化的模型,我们证明了这些新的影响热遗迹丰度是显着的,足以使它值得研究更现实的共湮灭的情况。

英文摘要:

The formation of meta-stable dark matter bound states in coannihilating scenarios could efficiently occur through the scattering with a variety of Standard Model bath particles, where light bosons during the electroweak cross over or even massless photons and gluons are exchanged in the t-channel. The amplitudes for those higher-order processes, however, are divergent in the collinear direction of the in- and out-going bath particles if the mediator is massless. To address the issue of collinear divergences, we derive the bound-state formation collision term in the framework of non-equilibrium quantum field theory. The main result is an expression for a more general cross section, which allows to compute higher-order bound-state formation processes inside the primordial plasma background in a comprehensive manner. Based on this result, we show that next-to-leading order contributions, including the bath-particle scattering, are i) collinear finite and ii) generically dominate over the on-shell emission for temperatures larger than the absolute value of the binding energy. Based on a simplified model, we demonstrate that the impact of these new effects on the thermal relic abundance is significant enough to make it worthwhile to study more realistic coannihilation scenarios.

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