Ultralight scalar dark matter has been proposed to constitute a component of dark matter, though the minimal scenarios have increasingly become constrained. In this work, we analyze scenarios where the dark matter consists of more than one ultralight boson, each with different masses. This potentially leads to formation of gravitationally-bound Bose-Einstein condensates with structures that are very different from condensates composed of a single scalar field. By generalizing from the well-understood single-flavor case, we explore a large range of input parameters, subject to stability criteria, and determine the allowed parameter space for two-flavor condensates as a function of particle physics parameters, paying particular attention to cases where such condensates could compose galactic cores. We also analyze single-flavor condensates subject to external gravity from massive inner bodies and find that such systems may mimic the size of galactic cores as well.

中文翻译：

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由多种轴子组成的星系凝聚体

超轻标量暗物质已被提议构成暗物质的一个组成部分，尽管最小场景越来越受到限制。在这项工作中，我们分析了暗物质由多个超轻玻色子组成的场景，每个超轻玻色子都有不同的质量。这可能导致形成引力束缚的玻色-爱因斯坦凝聚体，其结构与由单个标量场组成的凝聚体非常不同。通过从广为人知的单一风味情况进行概括，我们探索了大范围的输入参数，受稳定性标准的约束，并确定作为粒子物理参数的函数的两种风味缩合物的允许参数空间，特别注意案例这种凝聚物可以在这里构成星系核。