非最小引力暗物质晕中孤子的新结构与坍缩
Novel structures and collapse of solitons in nonminimally gravitating dark matter halos
AI总结：
本文通过模拟研究非最小引力效应下暗物质孤子的形成与坍缩，发现负势曲率区域的出现以及正负耦合常数下孤子均在临界密度坍缩，并验证了强非最小引力效应可促进多尺度结构形成。
摘要：
超轻暗物质模拟预测在暗物质晕中心存在具有短程关联的凝聚体，称为孤子或玻色星。本文研究了受非最小引力效应影响的暗物质孤子的形成与坍缩，该效应的特征在于暗物质的梯度依赖自相互作用以及引力泊松方程中存在一个额外源项。我们的模拟表明，暗物质的初始演化与没有非最小引力效应时的情形相似。然而，可能会出现负势曲率区域，并且当密度达到某些临界值时，无论耦合常数为正还是为负，孤子都会发生坍缩。在强非最小引力效应下，我们验证了线性密度扰动可以在大尺度和小尺度上增长，从而可能促进结构形成。
英文摘要：
Ultralight dark matter simulations predict condensates with short-range correlation, known as solitons or boson stars, at the centers of dark matter halos. This paper investigates the formation and collapse of dark matter solitons influenced by nonminimal gravitational effects, characterized by gradient-dependent self-interactions of dark matter and an additional source in Poisson's equation for gravity. Our simulations suggest that the initial evolution of dark matter resembles that without nonminimal gravitational effects. However, regions with negative potential curvature may develop, and solitons will collapse when their densities reach certain critical values for both positive and negative coupling constants. With strong nonminimal gravitational effects, we verify that linear density perturbations could grow on both large and small scales, potentially enhancing structure formation.
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