arXiv 1104.35912011-04-20hep-phastro-ph.CO

非热暗物质模型中残余密度和动力学解耦的精确估计

Accurate estimate of the relic density and the kinetic decoupling in non-thermal dark matter models

Giorgio Arcadi, Piero Ullio

发表信息：: Phys.Rev.D84:043520,2011
DOI：: 10.1103/PhysRevD.84.043520

摘要：

非热暗物质的产生是热WIMP暗物质的标准范例的一个有吸引力的替代方案。我们重新考虑非热生产机制，在一个系统的方式，并制定了一个数值代码精确计算的暗物质遗迹密度。我们讨论了在特定的情况下，长寿的大质量状态衰减成暗物质粒子，自然出现在几个超越标准模型理论，如超引力和超弦框架。由于非热生产有利于暗物质候选人与大对湮灭率，我们分析了可能的连接与异常检测到的轻子宇宙射线通量的帕梅拉和费米。集中在超对称模型，我们认为这些非标准的宇宙学在选择一个首选的质量尺度最轻的超对称粒子作为暗物质候选人的影响，以及随之而来的影响，在LHC发现或排除的新物理的解释。最后，我们研究了一个相当有预测性的模型，G2-MSSM，调查一些标准的假设通常实施的解决方案中的玻尔兹曼方程的暗物质组件，包括共湮灭。我们质疑的假设，动力学平衡举行沿整个阶段的暗物质的产生，和因式分解的有效性通常实施重写耦合玻尔兹曼方程的系统为每个共湮灭的物种作为一个单一的方程的总和的所有数密度。作为一个副产品，我们在这里开发的形式主义，以计算的动力学解耦温度的情况下，coannihilating粒子，这也可以应用于其他粒子物理框架，也可以在一个标准的宇宙学的标准热遗迹。

英文摘要：

Non-thermal dark matter generation is an appealing alternative to the standard paradigm of thermal WIMP dark matter. We reconsider non-thermal production mechanisms in a systematic way, and develop a numerical code for accurate computations of the dark matter relic density. We discuss in particular scenarios with long-lived massive states decaying into dark matter particles, appearing naturally in several beyond the standard model theories, such as supergravity and superstring frameworks. Since non-thermal production favors dark matter candidates with large pair annihilation rates, we analyze the possible connection with the anomalies detected in the lepton cosmic-ray flux by Pamela and Fermi. Concentrating on supersymmetric models, we consider the effect of these non-standard cosmologies in selecting a preferred mass scale for the lightest supersymmetric particle as dark matter candidate, and the consequent impact on the interpretation of new physics discovered or excluded at the LHC. Finally, we examine a rather predictive model, the G2-MSSM, investigating some of the standard assumptions usually implemented in the solution of the Boltzmann equation for the dark matter component, including coannihilations. We question the hypothesis that kinetic equilibrium holds along the whole phase of dark matter generation, and the validity of the factorization usually implemented to rewrite the system of coupled Boltzmann equation for each coannihilating species as a single equation for the sum of all the number densities. As a byproduct we develop here a formalism to compute the kinetic decoupling temperature in case of coannihilating particles, which can be applied also to other particle physics frameworks, and also to standard thermal relics within a standard cosmology.

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