论文标题
模糊暗物质光环中的连贯和不连贯的结构
Coherent and incoherent structures in fuzzy dark matter halos
论文作者
论文摘要
我们表明，模糊的暗物质光环在场构型的连贯性程度上表现出空间分化，从中央孤子芯中的完全相干到外部的不一致，在两个阶段之间有一个交叉区域。孤子芯确实是一种纯冷凝物，它几乎与对应于一颗粒子密度矩阵最大的特征值的penrose-os-osager模式完美重叠。围绕核心的病毒外光环在径向和时间平均时没有明显的连贯性。但是，当在本地和短时间内查看时，可以描述为表现出局部抑制的波动的准偶合团块的集合，这些波动可以用通常称为颗粒的结构来识别。整个光环中的相位相干性受到分隔局部准键合区域的动态发展纠结的旋转网络的抑制。此外，外光晕的无量纲相位密度显着降至核心的值。我们进一步研究了这种空间结构的动力学，发现核心的振荡可以分别通过两个时间依赖的参数来准确地描述，这些参数表征了核心的大小，$ r_c（t）$和交叉区域，$ r_t（t）$。对于我们的合并模拟中产生的光环，此功能反映在（反）相关的磁场配置功率光谱的峰值的相关振荡中。病毒化光环的湍流涡流缠结似乎在探测的时间尺度上达到了准平衡状态，动能的不可压缩成分在其光谱中表现出特征性的$ k^{ - 3} $尾巴，表明$ρ\ sim r^sim r^2 $密度profiles围绕量子vortex卷块。相应功率光谱中峰值波数的比较表明涡流...
We show that fuzzy dark matter halos exhibit spatial differentiation in the degree of coherence of the field configuration, ranging from completely coherent in the central solitonic core to incoherent outside it, with a crossover region in between the two phases. The solitonic core is indeed a pure condensate which overlaps almost perfectly with the Penrose-Onsager mode corresponding to the largest eigenvalue of the one-particle density matrix. The virialized outer halo surrounding the core exhibits no clear coherence as a whole upon radial and temporal averaging. However, when viewed locally and for short times, it can be described as a collection of quasi-condensate lumps exhibiting locally suppressed fluctuations which can be identified with the structures commonly referred to as granules. Phase coherence across the entire halo is inhibited by a dynamically evolving tangled web of vortices separating the localized quasi-condensate regions. Moreover, the dimensionless phase-space density in the outer halo drops significantly below its value at the core. We further examine the dynamics of this spatial structure and find that the oscillations of the core can be accurately described by two time-dependent parameters respectively characterizing the size of the core, $r_c(t)$, and the crossover region, $r_t(t)$. For the halos produced in our merger simulations this feature is reflected in the (anti-)correlated oscillation of the peak value of the field configuration's power-spectrum. The turbulent vortex tangle of the virialized halo appears to reach a quasi-equilibrium state over probed timescales, with the incompressible component of the kinetic energy exhibiting a characteristic $k^{-3}$ tail in its spectrum, indicative of a $ρ\sim r^2$ density profile around the quantum vortex cores. Comparison of the peak wavenumbers in the corresponding power-spectra shows that the inter-vortex...
