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arXiv 0901.2722gr-qcastro-ph.HE
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在双中子星的螺旋过程中能探测到磁场吗?

Can magnetic fields be detected during the inspiral of binary neutron stars?

Bruno Giacomazzo, Luciano Rezzolla, Luca Baiotti

摘要:

利用精确的和完全广义相对论的模拟,我们评估的效果,磁场的引力波发射产生的磁化中子星的螺旋和合并。特别是,我们表明,磁场有一个合并后的影响,因为他们被放大的开尔文-亥姆霍兹不稳定性,但也在inspiral,最有可能是因为磁张力减少了恒星潮汐变形非常大的初始磁场,B_0>~10^{17}G。我们量化的磁场的影响,通过计算重叠,O,在由磁化和未磁化的双星inspiral期间产生的波形之间。我们发现,对于任何实际磁场强度B_0<~10^{14}G,内旋过程中的重叠是O>~0.999,并且对中子星的质量相当不敏感。只有在像B_0~10^{17}G这样不切实际的大磁场下,重叠才明显减小,对于重子质量M_b~1.4/1.6 Msun的恒星,在我们的分辨率下,重叠分别变为O<~0.76/0.67。由于中子星预计会与~10^{8}-10 ^10}G的磁场合并,并且由于目前的探测器对O<~0.995敏感,我们得出结论,目前的探测器不太可能能够在中子星的螺旋过程中识别磁场的存在。

英文摘要:

Using accurate and fully general-relativistic simulations we assess the effect that magnetic fields have on the gravitational-wave emission produced during the inspiral and merger of magnetized neutron stars. In particular, we show that magnetic fields have an impact after the merger, because they are amplified by a Kelvin-Helmholtz instability, but also during the inspiral, most likely because the magnetic tension reduces the stellar tidal deformation for extremely large initial magnetic fields, B_0>~10^{17}G. We quantify the influence of magnetic fields by computing the overlap, O, between the waveforms produced during the inspiral by magnetized and unmagnetized binaries. We find that for any realistic magnetic field strength B_0<~10^{14}G the overlap during the inspiral is O>~0.999 and is quite insensitive to the mass of the neutron stars. Only for unrealistically large magnetic fields like B_0~10^{17}G the overlap does decrease noticeably, becoming at our resolutions O<~0.76/0.67 for stars with baryon masses M_b~1.4/1.6 Msun, respectively. Because neutron stars are expected to merge with magnetic fields ~10^{8}-10^{10}G and because present detectors are sensitive to O<~0.995, we conclude that it is very unlikely that the present detectors will be able to discern the presence of magnetic fields during the inspiral of neutron stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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