Assuming that dark matter is an ultralight pseudoscalar particle which couples to electromagnetism like an axion (an ALP), we demonstrate that the coupling of the cosmological magnetic field produced by the ALP field oscillations to the primordial dark matter fluctuations yields a spectrum of gauge field fluctuations which can produce a sufficient flux of Lyman-Werner photons to enable the Direct Collapse Black Hole formation scenario. The induced flux is consistent with the bounds on the excess flux of radio photons from ARCADE2 and EDGES measurements.
Secondary Production of Photons from ALP Dark Matter interacting with a Cosmological Magnetic Field
McGill University（麦吉尔大学）；Instituto de Fisica Teorica, UNESP-Universidade Estadual Paulista（圣保罗州立大学理论物理研究所）；Trottier Space Institute, Department of Physics, McGill University（麦吉尔大学特罗蒂尔空间研究所）；Department of Physics, Institute of Science Tokyo（东京科学大学物理系）
类轴子粒子（axion like particles，ALP）的低质量和小耦合通常被认为是其宇宙学寿命的保证，使其成为优秀的暗物质候选者。也就是说，玻色增强可能会刺激衰变并挑战这种范式。在这里，我们分析和审查的宇宙学衰变的ALP到光子，考虑玻色增强，从而超越了通常的天真微扰估计。乍一看，这个计算似乎产生了一个指数增长的共振，因此衰减速度极快。然而，由于宇宙的膨胀以及光子的有效等离子体质量导致的衰变产物的红移可以阻止有效的共振。虽然这一结果与QCD轴子的现有分析一致，但对于更一般的ALP，可以增强光子耦合，稳定性只能通过膨胀和等离子体效应的组合来确保。
Beyond thermal approximations: Precise cosmological bounds on Axion-Like Particles
Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València（瓦伦西亚大学-CSIC 粒子物理研究所）；Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Ferrara（意大利国家核物理研究院费拉拉分部）；Faculdade de Ciências e Tecnologia and CFisUC, Departamento de Física, Universidade de Coimbra（科英布拉大学科学与技术学院及CFisUC物理系）；Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno（萨莱诺大学“E.R. Caianiello”物理系）；Istituto Nazionale di Fisica Nucleare - Gruppo Collegato di Salerno - Sezione di Napoli（意大利国家核物理研究院那不勒斯分部萨莱诺协作组）
