利用EPTA对最小耦合与共形耦合超轻暗物质的约束
Constraints on minimally and conformally coupled ultralight dark matter with the EPTA
AI总结：
本文利用EPTA脉冲星计时阵列数据，研究仅引力耦合及共形耦合的超轻暗物质约束，发现前者可限制到暗物质丰度的十分之几，后者对标量耦合的约束比现有界限提高数个数量级。
摘要：
毫秒脉冲星是极其稳定的天然计时器。脉冲星计时阵列实验通过追踪脉冲星自转周期的细微变化，能够揭示银河系中超轻粒子的存在。在这篇会议论文中，我们首先回顾最保守的情形，即超轻粒子仅通过引力相互作用。在该设定下，我们表明脉冲星计时阵列能够将超轻场的丰度约束到观测暗物质丰度的十分之几以内。随后，我们考虑共形耦合的超轻候选粒子，证明在脉冲星计时阵列分析的相关质量范围内，对场与标准模型粒子之间普适标量耦合的约束比现有界限提高了数个数量级。本文的讨论基于文献[1,2]。
英文摘要：
Millisecond pulsars are extremely stable natural timekeepers. Pulsar Timing Array experiments, tracking subtle changes in the pulsars' rotation periods, can shed light on the presence of ultralight particles in our Galaxy. In this conference paper, we start by reviewing the most conservative scenario, in which ultralight particles interact only gravitationally. In this setting, we show that Pulsar Timing Arrays are able to constrain the presence of ultralight fields up to a few tenths of the observed dark matter abundance. Then, we consider conformally coupled ultralight candidates, demonstrating that the constraints on the universal scalar coupling of the field to Standard Model particles improve on existing bounds by several orders of magnitude, in the relevant mass range analyzed by Pulsar Timing Arrays. The discussion presented here is based on [1,2].
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