论文标题
非同质性中子星际内部的超氟涡流介导的相互摩擦
Superfluid vortex-mediated mutual friction in non-homogeneous neutron star interiors
论文作者
论文摘要
了解中子恒星内部多种超氟涡旋的平均运动是大多数脉冲星理论的关键成分。在本文中，我们提出了一种动力学方法来计算中子恒星中正常和超氟组分之间的动量交换的相互摩擦力，在该恒星中，从适当的平均运动中提取了相互摩擦，而在许多涡流线的运动中。作为在中子星中许多涡流线的重纺和销售过程进行更好建模的第一步，我们在这里仅考虑直截了当和非相互作用的涡旋：我们采用了一个最小的模型，以使点旋转的动力学在两个层中沉浸在非均匀介质中的二维整合的动力学。由于未知中子恒星的内壳或外部核心中的疾病程度是未知的，因此我们比较了周期性和无序围与无序的两种情况。这种方法允许在恒星中的超流体和正常成分之间提取相互摩擦，此外，除了通常的马格努斯和作用在涡旋线上的阻力力之外，还在起作用。还讨论了疾病对繁殖过渡的影响。
Understanding the average motion of a multitude of superfluid vortices in the interior of a neutron star is a key ingredient for most theories of pulsar glitches. In this paper we propose a kinetic approach to compute the mutual friction force that is responsible for the momentum exchange between the normal and superfluid components in a neutron star, where the mutual friction is extracted from a suitable average over the motion of many vortex lines. As a first step towards a better modelling of the repinning and depinning processes of many vortex lines in a neutron star, we consider here only straight and non-interacting vortices: we adopt a minimal model for the dynamics of an ensemble of point vortices in two dimensions immersed in a non-homogeneous medium that acts as a pinning landscape. Since the degree of disorder in the inner crust or outer core of a neutron star is unknown, we compare the two possible scenarios of periodic and disordered pinscapes. This approach allows to extract the mutual friction between the superfluid and the normal component in the star when, in addition to the usual Magnus and drag forces acting on vortex lines, also a pinning force is at work. The effect of disorder on the depinning transition is also discussed.
