arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.04671hep-ph
收藏

漏入暗物质

Leak-in Dark Matter

Jared A. Evans, Cristian Gaidau, Jessie Shelton

摘要:

我们引入漏入暗物质,一种新的宇宙中的暗物质(DM)的非平衡起源。我们提供了一个全面和统一的讨论,一个最小的,内部热化,隐藏的部门人口从一个平衡,弱连接到较热的标准模型(SM)部门。我们强调,当这种平衡外的相互作用是重整化,较冷的部门经历了一个扩展阶段的非绝热演化在很大程度上独立于初始条件,我们称之为“漏入”。“我们一般性地讨论了泄漏阶段,并建立了从经历这种泄漏阶段的辐射浴中冻结出来的暗物质的一般性质。作为一个具体的例子,我们考虑一个模型,其中SM具有一个最小的隐藏部门的平衡B-L向量门户相互作用。我们详细讨论了这个理论中漏入和冻结过程之间的相互作用,并展示了漏入产生完整遗迹丰度的区域。我们研究了B-L矢量门漏入DM的观测前景,发现尽管需要与SM的小耦合,但各种实验都可以作为漏入暗物质的敏感探针。此外,目前所有的限制允许的区域产生DM与自相互作用足够大,以解决小规模的结构异常。

英文摘要:

We introduce leak-in dark matter, a novel out-of-equilibrium origin for the dark matter (DM) in the universe. We provide a comprehensive and unified discussion of a minimal, internally-thermalized, hidden sector populated from an out-of-equilibrium, feeble connection to the hotter standard model (SM) sector. We emphasize that when this out-of-equilibrium interaction is renormalizable, the colder sector undergoes an extended phase of non-adiabatic evolution largely independent of initial conditions, which we dub "leak-in." We discuss the leak-in phase in generality, and establish the general properties of dark matter that freezes out from a radiation bath undergoing such a leak-in phase. As a concrete example, we consider a model where the SM has an out-of-equilibrium B-L vector portal interaction with a minimal hidden sector. We discuss the interplay between leak-in and freezein processes in this theory in detail and demonstrate regions where leak-in yields the full relic abundance. We study observational prospects for B-L vector portal leak-in DM, and find that despite the requisite small coupling to the SM, a variety of experiments can serve as sensitive probes of leak-in dark matter. Additionally, regions allowed by all current constraints yield DM with self-interactions large enough to address small-scale structure anomalies.

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。

↑