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arXiv 0708.2352astro-phnucl-th
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强磁场中夸克物质各向异性中微子发射引起的脉冲星反冲

Pulsar kicks by anisotropic neutrino emission from quark matter in strong magnetic fields

I. Sagert, J. Schaffner-Bielich

摘要:

讨论了一种基于原中子星内部直接夸克Urca过程的非对称中微子辐射的脉冲星加速机制。各向异性是由强磁场引起的,该磁场使电子的自旋极化成与场方向相反。由于宇称破缺,中微子和反中微子从一个方向离开恒星,加速脉冲星。我们计算不同的夸克化学势的反冲速度的夸克相温度和它的半径的依赖。忽略中微子夸克散射,我们发现在夸克相半径为10 km,温度大于5 MeV的情况下,可以很容易地达到1000 km/s的反冲速度$^{-1}$。另一方面,考虑到小中微子平均自由程,似乎不可能达到速度高于100公里秒$^{-1}$,即使包括色超导的影响,中微子夸克相互作用被抑制。

英文摘要:

We discuss a pulsar acceleration mechanism based on asymmetric neutrino emission from the direct quark Urca process in the interior of proto neutron stars. The anisotropy is caused by a strong magnetic field which polarises the spin of the electrons opposite to the field direction. Due to parity violation the neutrinos and anti-neutrinos leave the star in one direction accelerating the pulsar. We calculate for varying quark chemical potentials the kick velocity in dependence of the quark phase temperature and its radius. Ignoring neutrino quark scattering we find that within a quark phase radius of 10 km and temperatures larger than 5 MeV kick velocities of 1000km s$^{-1}$ can be reached very easily. On the other hand taking into account the small neutrino mean free paths it seems impossible to reach velocities higher than 100km s$^{-1}$ even when including effects from colour superconductivity where the neutrino quark interactions are suppressed.

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