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arXiv 0909.1317hep-phastro-ph.COhep-th
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强烈一级相变对热遗迹丰度的影响

The impact of a strongly first-order phase transition on the abundance of thermal relics

Carroll Wainwright, Stefano Profumo

摘要:

我们研究了一个强烈的一阶电弱相变的热遗迹丰富的粒子物种,可以构成暗物质和去耦之前的相变发生的影响。我们定义了一个稀释因子引起的通用一阶相变,我们探索的最小超对称扩展的标准模型的参数空间,以确定哪些相变温度和稀释因子是相关的最轻的中性子作为暗物质候选人。然后,我们专注于一个特定的玩具模型设置,可以引起强烈的一阶电弱相变,并进行详细的计算稀释因子和过渡温度,比较我们的研究结果,实际中性伴子暗物质模型。典型的模型会产生过多的热遗迹密度,并可以挽救假设一个强烈的一阶电弱相变包括大质量(多TeV)的维诺或希格西诺类中性伴子,以及在更宽的质量范围内的比诺类中性伴子,质量低至400 GeV。如果大型强子对撞机的数据表明,推测的热中性伴子遗迹丰度大于冷暗物质密度,那么这种不匹配可能由电-弱尺度物理学来解释,在不久的将来,对撞机实验也将对其进行彻底的探索。

英文摘要:

We study the impact of a strongly first-order electro-weak phase transition on the thermal relic abundance of particle species that could constitute the dark matter and that decoupled before the phase transition occurred. We define a dilution factor induced by generic first-order phase transitions, and we explore the parameter space of the minimal supersymmetric extension to the Standard Model to determine which phase transition temperatures and dilution factors are relevant for the lightest neutralino as a dark matter candidate. We then focus on a specific toy-model setup that could give rise to a strongly first-order electro-weak phase transition, and proceed to a detailed calculation of dilution factors and transition temperatures, comparing our findings to actual neutralino dark matter models. Typical models that would produce an excessive thermal relic density and that can be salvaged postulating a strongly first-order electro-weak phase transition include massive (multi-TeV) wino or higgsino-like neutralinos, as well as bino-like neutralinos in a wider mass range, with masses as low as 400 GeV. If LHC data indicate an inferred thermal neutralino relic abundance larger than the cold dark matter density, the mismatch could thus potentially be explained by electro-weak scale physics that will also be thoroughly explored with collider experiments in the near future.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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