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arXiv 1012.0345astro-ph.HEhep-phnucl-th
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超流中子星中的耗散过程

Dissipative processes in superfluid neutron stars

Massimo Mannarelli, Giuseppe Colucci, Cristina Manuel

摘要:

我们提出了一些关于一种新的阻尼机制的r-模式振荡的中子星由于过程中,改变质子,中子和电子的数量。偏离平衡的各种物种的数量密度导致的外观在欧拉方程的系统的耗散机制,所谓的火箭效应。旋转中子星的r模振荡的演化受到火箭效应的影响,我们提出了相应的阻尼时标的估计。在系统的描述中,我们采用双流体模型,其中一种流体由通过电磁相互作用锁定在一起的所有带电组分组成,而第二种流体由超流中子组成。两种成分都可以振荡,但是火箭效应只能有效地阻尼反向的r模式振荡,两种流体振荡异相。在我们的分析中,我们考虑了中子超流体与带电组分之间的相互摩擦耗散过程。我们忽略了两个r模振荡之间的相互作用以及与恒星地壳相关的影响。此外,我们还采用了一个简化的中子星模型,假定质量分布均匀。

英文摘要:

We present some results about a novel damping mechanism of r-mode oscillations in neutron stars due to processes that change the number of protons, neutrons and electrons. Deviations from equilibrium of the number densities of the various species lead to the appearance in the Euler equations of the system of a dissipative mechanism, the so-called rocket effect. The evolution of the r-mode oscillations of a rotating neutron star are influenced by the rocket effect and we present estimates of the corresponding damping timescales. In the description of the system we employ a two-fluid model, with one fluid consisting of all the charged components locked together by the electromagnetic interaction, while the second fluid consists of superfluid neutrons. Both components can oscillate however the rocket effect can only efficiently damp the countermoving r-mode oscillations, with the two fluids oscillating out of phase. In our analysis we include the mutual friction dissipative process between the neutron superfluid and the charged component. We neglect the interaction between the two r-mode oscillations as well as effects related with the crust of the star. Moreover, we use a simplified model of neutron star assuming a uniform mass distribution.

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