Small-scale structure in vector dark matter
Small-scale structure in vector dark matter
复制标题
矢量暗物质中的小尺度结构
DOI：
10.1088/1475-7516/2022/08/014
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发表时间：
2022
影响因子：
6.4
通讯作者：
P. Mocz
中科院分区：
文献类型：
--
作者：
M. Amin;Mudit Jain;Rohith Karur;P. Mocz
我们利用单/多组分Schrödinger-Poisson系统的3+1维模拟研究了矢量暗物质（VDM）和标量暗物质（SDM）的小尺度结构差异。我们发现，波干涉量、核晕质量比（及其散射）、核自旋以及暗物质晕中心区域的形状可以区分VDM和SDM。从一组理想的光晕（自引力孤子）作为初始条件开始，我们证明了系统动态演化为一个近似球对称的构型，其核心被质量密度中的干涉图案光晕包围。在矢量情况下，与标量情况相比，中心孤子密度较小，并且具有向r -3尾部的平滑过渡。与SDM相比，VDM中的波干扰小了约1/√3倍，导致低密度和高密度区域更少，晕中的弥散颗粒更多。VDM的核心质量与总光晕质量之比低于SDM，对系统总能量的依赖更大，散射略大。最后，我们还研究了VDM情况下自旋角动量的演化。我们看到模拟中的总固有自旋与最终核心的自旋呈正相关，具有显著的散点。我们看到，即使在初始条件下（至少在瞬间）总角动量消失的情况下，核心的大自旋也是可能的。我们的研究结果指出了利用天体物理和地面观测来区分VDM和SDM的可能性。
We investigate the differences in the small-scale structure of vector dark matter (VDM) and scalar dark matter (SDM) using 3+1 dimensional simulations of single/multicomponent Schrödinger-Poisson system. We find that the amount of wave interference, core-to-halo mass ratio (and its scatter), spin of the core, as well as the shape of the central regions of dark matter halos can distinguish VDM and SDM. Starting with a collection of idealized halos (self-gravitating solitons) as an initial condition, we show that the system dynamically evolves to an approximately spherically symmetric configuration that has a core surrounded by a halo of interference patterns in the mass density. In the vector case, the central soliton in less dense and has a smoother transition to an r -3 tail compared to the scalar case. As compared to SDM, wave interference in VDM is ∼ 1/√3 times smaller, resulting in fewer low and high density regions, and more diffuse granules in the halo. The ratio of VDM core mass to the total halo mass is lower than that in SDM, with a steeper dependence on the total energy of the system and a slightly larger scatter. Finally, we also initiate a study of the evolution of intrinsic spin angular momentum in the VDM case. We see a positive correlation between the total intrinsic spin in the simulation and the spin of the final central core, with significant scatter. We see large intrinsic spin in the core being possible even with vanishing amounts total angular momentum in the initial conditions (at least instantaneously). Our results point towards the possibility of distinguishing VDM from SDM using astrophysical and terrestrial observations.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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