论文标题
通过大规模结构镜头的暗物质稀释机制
Dark Matter Dilution Mechanism through the Lens of Large Scale Structure
论文作者
论文摘要
熵产生是解决热遗物过度人口的必要成分。它被广泛用于粒子物理模型中，用于解释暗物质的起源。在宇宙主导的同时，腐烂到已知粒子的长寿命粒子扮演了稀释器的作用。我们指出了其部分衰变对暗物质对原始物质功率谱的影响。我们首次使用SDSS数据从大规模结构观察中对稀释器与暗物质的分支比率进行了严格的限制。这提供了一种新颖的工具，用于测试用暗物质稀释机制测试模型。我们将其应用于左右对称模型，并表明它牢固地排除了右旋中微子温暖暗物质的大部分参数空间。
Entropy production is a necessary ingredient for addressing the over-population of thermal relics. It is widely employed in particle physics models for explaining the origin of dark matter. A long-lived particle that decays to the known particles, while dominating the universe, plays the role of the dilutor. We point out the impact of its partial decay to dark matter on the primordial matter power spectrum. For the first time, we derive a stringent limit on the branching ratio of the dilutor to dark matter from large scale structure observation using the SDSS data. This offers a novel tool for testing models with a dark matter dilution mechanism. We apply it to the left-right symmetric model and show that it firmly excludes a large portion of parameter space for right-handed neutrino warm dark matter.
