论文标题
用星际中等加热来限制轴子和紧凑的暗物质
Constraining axion and compact dark matter with interstellar medium heating
论文作者
论文摘要
冷星气体系统已用于通过DM的加热速率低于气体的天体冷却速率来限制暗物质（DM）模型。遵循Wadekar和Farrar（2021）的方法，我们使用了富含气体的矮星银河系的星际介质，Leo T和银河系环境气体云，G33.4-8.0来限制DM。狮子座是一个特别强大的系统，因为其气体可以在晚期宇宙中所有物体中的冷却速率最低（由于气体的低量密度和金属性）。 Milky Way clouds, in some cases, provide complementary limits as the DM-gas relative velocity in them is much larger than that in Leo T. We derive constraints on the following scenarios in which DM can heat the gas: $(i)$ interaction of axions with hydrogen atoms or free electrons in the gas, $(ii)$ deceleration of relic magnetically charged DM in gas plasma, $(iii)$ dynamical friction from紧凑型DM，$（iv）$用气体的复合DM硬球散射。我们的限制是DM直接检测搜索的补充。从即将进行的21厘米和光学调查中检测出更多富含气体的低质量矮人，例如Leo t，可以改善我们的边界。
Cold interstellar gas systems have been used to constrain dark matter (DM) models by the condition that the heating rate from DM must be lower than the astrophysical cooling rate of the gas. Following the methodology of Wadekar and Farrar (2021), we use the interstellar medium of a gas-rich dwarf galaxy, Leo T, and a Milky Way-environment gas cloud, G33.4-8.0 to constrain DM. Leo T is a particularly strong system as its gas can have the lowest cooling rate among all the objects in the late Universe (owing to the low volume density and metallicity of the gas). Milky Way clouds, in some cases, provide complementary limits as the DM-gas relative velocity in them is much larger than that in Leo T. We derive constraints on the following scenarios in which DM can heat the gas: $(i)$ interaction of axions with hydrogen atoms or free electrons in the gas, $(ii)$ deceleration of relic magnetically charged DM in gas plasma, $(iii)$ dynamical friction from compact DM, $(iv)$ hard sphere scattering of composite DM with gas. Our limits are complementary to DM direct detection searches. Detection of more gas-rich low-mass dwarfs like Leo T from upcoming 21cm and optical surveys can improve our bounds.
