Neutron Stars (NSs) are compact stellar objects that are stable solutions in General Relativity. Their internal structure is usually described using an equation of state that involves the presence of ordinary matter and its interactions. However there is now a large consensus that an elusive sector of matter in the universe, described as dark matter, remains as yet undiscovered. In such a case, NSs should contain both, baryonic and dark matter. We argue that depending on the nature of the dark matter and in certain circumstances, the two matter components would form a mixture inside NSs that could trigger further changes, some of them observable. The very existence of NSs constrains the nature and interactions of dark matter in the universe.

中文翻译：

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中子星作为暗物质的探测器

中子星 (NS) 是紧凑的恒星物体，在广义相对论中是稳定的解。它们的内部结构通常使用状态方程来描述，该方程涉及普通物质的存在及其相互作用。然而，现在人们普遍认为，宇宙中一个难以捉摸的物质部分，被称为暗物质，仍未被发现。在这种情况下，NS 应该同时包含重子和暗物质。我们认为，根据暗物质的性质以及在某些情况下，这两种物质成分会在 NS 内部形成一种混合物，从而引发进一步的变化，其中一些是可以观察到的。NS 的存在本身就限制了宇宙中暗物质的性质和相互作用。