Constraining dark matter self-interactions with simulations and observations

通过模拟和观测限制暗物质的自相互作用

• 批准号: 2159982
• 金额: --
• 依托单位: Liverpool John Moores University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2159982
• 关键词: Constraining; dark; matter; self; interactions

The standard model of cosmology assumes that dark matter interacts with itself and with other matter and energy via gravity only. This is the simplest possible model for dark matter and it describes a wide range of observations of our Universe quite well. However, recent comparisons to observations on small scales appear at odds with theoretical predictions, which might suggest that dark matter is more complex than previously assumed. From a particle physics point of view, there are strong theoretical reasons for believing that dark matter should weakly interact with itself, but the degree of complexity of these interactions is poorly understood. We will explore the consequences of self-interacting dark matter (SIDM) on a wide range of scales using full cosmological hydrodynamical simulations, going beyond the simplest assumption of elastic scattering. We will make comparisons to a variety of observations to determine with SIDM provides an acceptable solution to the tensions with the standard model.

宇宙学的标准模型假设暗物质仅通过引力与自身以及其他物质和能量相互作用。这是最简单的暗物质模型，它很好地描述了我们宇宙的广泛观测。然而，最近与小尺度观测的比较似乎与理论预测不一致，这可能表明暗物质比以前假设的更复杂。从粒子物理学的角度来看，有很强的理论理由相信暗物质应该与自身弱相互作用，但这些相互作用的复杂程度却知之甚少。我们将探索自相互作用暗物质（SIDM）的后果在广泛的尺度上使用完整的宇宙学流体动力学模拟，超越最简单的弹性散射假设。我们将对各种观测结果进行比较，以确定SIDM提供了一个可接受的解决方案，与标准模型的紧张局势。