arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.01944hep-phastro-ph.CO
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DRAKE:超越动力学平衡的暗物质遗迹

DRAKE: Dark matter Relic Abundance beyond Kinetic Equilibrium

Tobias Binder, Torsten Bringmann, Michael Gustafsson, Andrzej Hryczuk

摘要:

我们介绍德雷克,一个数值精度工具预测的暗物质遗迹丰度也在冻结过程中的动力学平衡的标准假设的情况下,可能不会得到满足。德雷克配备了一套三个专用的玻尔兹曼方程求解器,分别实现了传统上采用的暗物质数密度方程,耦合数密度和速度色散演化的类流体方程,以及相空间分布的完整数值演化。我们回顾这些方法的一般动机,并举例说明,突出三个具体类别的模型,动力学和化学解耦交织在一起的方式,定量影响的遗迹密度:i)暗物质湮灭通过一个狭窄的共振,ii)Sommercant-enhanced湮灭和iii)“禁止”湮灭的最终状态是运动学上无法进入的阈值。我们讨论了所有这些情况下的一些细节,表明普遍采用的,传统的治疗方法可能会导致在估计的遗物密度是错误的高达一个数量级。公开发布的德雷克,以及如何计算混凝土模型中的遗迹密度的几个例子,提供在drake.hepforge.org

英文摘要:

We introduce DRAKE, a numerical precision tool for predicting the dark matter relic abundance also in situations where the standard assumption of kinetic equilibrium during the freeze-out process may not be satisfied. DRAKE comes with a set of three dedicated Boltzmann equation solvers that implement, respectively, the traditionally adopted equation for the dark matter number density, fluid-like equations that couple the evolution of number density and velocity dispersion, and a full numerical evolution of the phase-space distribution. We review the general motivation for these approaches and, for illustration, highlight three concrete classes of models where kinetic and chemical decoupling are intertwined in a way that quantitatively impacts the relic density: i) dark matter annihilation via a narrow resonance, ii) Sommerfeld-enhanced annihilation and iii) `forbidden' annihilation to final states that are kinematically inaccessible at threshold. We discuss all these cases in some detail, demonstrating that the commonly adopted, traditional treatment can result in an estimate of the relic density that is wrong by up to an order of magnitude. The public release of DRAKE, along with several examples of how to calculate the relic density in concrete models, is provided at drake.hepforge.org

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