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arXiv 0809.2942astro-phhep-ph
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镜像暗物质对中子星的影响

Effects of mirror dark matter on neutron stars

Fredrik Sandin, Paolo Ciarcelluti

摘要:

如果暗物质是由镜像重子构成的,那么它们存在于所有引力束缚结构中。在这里,我们研究镜像暗物质对中子星的影响,并讨论可能的观测结果。广义相对论流体静力学方程被推广到球形物体与多个流体的重力相互作用。我们使用的标准模型的最小奇偶对称扩展,这意味着在两个部门的微观物理是相同的。我们发现,质量半径关系显着修改的存在下,百分之几的镜像重子。这种效果模仿了其他外来植物的效果,例如,夸克物质与通常认为中子星平衡序列是唯一的观点相反,我们证明了它依赖于镜像重子与普通重子的相对数目。因此,它是历史依赖的。核心坍塌的临界质量,即,产生中子星的过程在镜像重子的存在下被改变。我们计算修改后的Escherasekhar质量,并将其与多项式拟合。百分之几的镜像重子足以使核心坍缩的临界质量降低~ 0.1M_sun。这可能允许形成非常紧凑的低质量中子星。

英文摘要:

If dark matter is made of mirror baryons, they are present in all gravitationally bound structures. Here we investigate some effects of mirror dark matter on neutron stars and discuss possible observational consequences. The general-relativistic hydrostatic equations are generalized to spherical objects with multiple fluids that interact by gravity. We use the minimal parity-symmetric extension of the standard model, which implies that the microphysics is the same in the two sectors. We find that the mass-radius relation is significantly modified in the presence of a few percent mirror baryons. This effect mimics that of other exotica, e.g., quark matter. In contrast to the common view that the neutron-star equilibrium sequence is unique, we show that it depends on the relative number of mirror baryons to ordinary baryons. It is therefore history dependent. The critical mass for core collapse, i.e., the process by which neutron stars are created, is modified in the presence of mirror baryons. We calculate the modified Chandrasekhar mass and fit it with a polynomial. A few percent mirror baryons is sufficient to lower the critical mass for core collapse by ~0.1 M_sun. This could allow for the formation of extraordinary compact neutron stars with low mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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