We show that the neutrino chirality flip, which can take place in the core of a neutron star at birth, is an efficient process to allow neutrinos to anisotropically escape, thus providing a to induce the neutron star kick velocities. The process is not subject to the no-go theorem since although the flip from left- to right-handed neutrinos happens at equilibrium, the reverse process does not take place given that right-handed neutrinos do not interact with matter and therefore detailed balance is lost. For simplicity, we model the neutron star core as being made of strange quark matter. We find that the process is efficient when the neutrino magnetic moment is not smaller than 4.7 × 10−15μ B, where μB is the Bohr magneton. When this lower bound is combined with the most stringent upper bound, which uses the luminosity data obtained from the analysis of SN 1987A, our results set a range for the neutrino magnetic moment given by 4.7 × 10−15 ≤ μ ν/μB ≤ (0.1−0.4) × 10−11. The obtained kick velocities for natal conditions are consistent with the observed ones and span the correct range of radii for typical magnetic field intensities.

中文翻译：

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中子星诞生时引起的反冲速度中微子磁矩的下界

我们表明，中微子手性翻转可以在出生时发生在中子星的核心中，是允许中微子各向异性逸出的有效过程，从而提供了诱导中子星踢速度的方法。该过程不受不通过定理因为尽管从左旋中微子到右旋中微子的翻转发生在平衡状态，但由于右旋中微子不与物质相互作用，因此不会发生相反的过程，因此失去了详细的平衡。为简单起见，我们将中子星核心建模为由奇异夸克物质构成。我们发现当中微子磁矩不小于4.7 × 10-15μ 乙， 在哪里μ乙是玻尔磁子。当这个下限与最严格的上限（使用从 SN 1987A 分析中获得的光度数据）结合时，我们的结果为中微子磁矩设定了一个范围，由下式给出4.7 × 10-15 ≤ μ ν/μ乙 ≤ (0.1-0.4) × 10-11. 获得的出生条件下的踢速度与观察到的一致，并且跨越了典型磁场强度的正确半径范围。