Long range dark matter self-interactions and plasma instabilities
Long range dark matter self-interactions and plasma instabilities
复制标题
长程暗物质自相互作用和等离子体不稳定性
DOI：
10.1088/1475-7516/2020/11/034
复制
发表时间：
2020
影响因子：
6.4
通讯作者：
R. Lasenby
中科院分区：
文献类型：
--
作者：
R. Lasenby
到目前为止，观察到的暗物质的效应与它纯粹的引力相互作用是一致的。然而，在许多模型中，暗物质与自身、与标准模型、和/或与其他隐藏扇区状态有额外的相互作用。在这篇文章中，我们讨论了暗物质通过光矢量介体相互作用，在暗物质粒子之间产生长程力的模型。通过这种力的相干散射效应可以导致微小扰动的指数增长，类似于电磁等离子体不稳定性。这些不稳定性在耦合中可能是显著的，比通常暗物质自我相互作用的粒子间相互作用的粒子约束低许多个数量级。虽然文献中已经注意到了这种可能性，但我们首次系统地研究了这种不稳定性，包括介体具有有限质量的情况。后者与动力学混合的“暗光子”介体模型有关，这些介体代表了拟议的暗物质探测实验的一个重要目标。我们的分析是关于小扰动的增长，因此不会立即提供对暗物质模型的观测约束--然而，它们确实推动了对参数空间大区域的进一步研究。
So far, the observed effects of dark matter are compatible with it having purely gravitational interactions. However, in many models, dark matter has additional interactions with itself, with the Standard Model, and/or with additional hidden sector states. In this paper, we discuss models in which dark matter interacts through a light vector mediator, giving rise to a long-ranged force between dark matter particles. Coherent scattering effects through this force can lead to the exponential growth of small perturbations, in analogy to electromagnetic plasma instabilities. These instabilities can be significant at couplings many orders of magnitude below those for which the usual particle-by-particle constraints on dark matter self-interactions apply. While this possibility has been noted in the literature, we provide the first systematic study of such instabilities, including the case where the mediator has finite mass. The latter is relevant for models of kinetically mixed 'dark photon' mediators, which represent an important target for proposed dark matter detection experiments. Our analyses are of the growth of small perturbations, so do not immediately provide observational constraints on dark matter models—however, they do motivate further study of large regions of parameter space.
影响因子：
5
作者：
Y. Hochberg;Y. Kahn;M. Lisanti;K. Zurek;A. Grushin;R. Ilan;S. Griffin;Zhen-Fei Liu;S. Weber
通讯作者：
Y. Hochberg;Y. Kahn;M. Lisanti;K. Zurek;A. Grushin;R. Ilan;S. Griffin;Zhen-Fei Liu;S. Weber
CHAMP宇宙射线
影响因子：
6.4
作者：
Dunsky, David;Hall, Lawrence J.;Harigaya, Keisuke
通讯作者：
Harigaya, Keisuke
影响因子：
4.4
作者：
Knapen, Simon;Lin, Tongyan;Zurek, Kathryn M.
通讯作者：
Zurek, Kathryn M.