论文标题
中子星的超流体外部核心的旋转不稳定性
Roton instabilities in the superfluid outer core of neutron stars
论文作者
论文摘要
我们通过由中微子超流体和质子超导体制成的流体动力模型研究中子恒星外核的超流体动力学，并由动态夹带和Skyrme Sly4核子 - 核子相互作用耦合。在搜索由超氟的相对运动触发的动态不稳定性时，探测了所得的非线性运动方程，这可能与脉冲星中观察到的时机异常有关。通过线性分析，探索了不稳定性的起源和预期增长，以改变核肌的密度。与以前的发现不同，我们模型中线性激发的分散表现出在成对的能量阈值下方的旋转结构，这是动态不稳定性的起源，最终可能导致新兴的涡度以及超富集密度的调制。
We study the superfluid dynamics of the outer core of neutron stars by means of a hydrodynamic model made of a neutronic superfluid and a protonic superconductor, coupled by both the dynamic entrainment and the Skyrme SLy4 nucleon-nucleon interactions. The resulting nonlinear equations of motion are probed in the search for dynamical instabilities triggered by the relative motion of the superfluids that could be related to observed timing anomalies in pulsars. Through linear analysis, the origin and expected growth of the instabilities is explored for varying nuclear-matter density. Differently from previous findings, the dispersion of linear excitations in our model shows rotonic structures below the pair-breaking energy threshold, which lies at the origin of the dynamical instabilities, and could eventually lead to emergent vorticity along with modulations of the superfluid density.
