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arXiv 2104.00422astro-ph.HE
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中子星到夸克星相变的多信使信号

Multimessenger signal from phase transition of neutron star to quark star

Debojoti Kuzur, Ritam Mallick, Prasad R, Shailendra Singh

摘要:

目的:研究中子星到夸克星的相变信号的多信使性质及其相应的天体物理观测。研究方法:相变过程是由恒星中心突然的压力和密度变化引发的,产生了一个冲击,它使物质去微粒化,然后是一个弱锋,将多余的物质转化为奇异夸克,以达到绝对稳定。这个过程的影响是通过了解能量如何以中微子-反中微子湮灭的形式从恒星逃逸来研究的。对于这种湮灭过程,计算了相应的能量沉积率。由于能量损失而引起的结构变化已经在恒星失准角演化和通过引力波进行的天体物理观测等方面进行了研究。结果如下:中微子-反中微子湮灭的能量和时间特征与观测到的短伽马射线暴的各向同性能量进行了比较。失准角的演变使恒星的倾斜轴对齐,这可能导致脉冲星的射电强度突然增加或减少。相应的引力波发射,无论是连续的还是爆发的,都导致来自相变的多信使信号。

英文摘要:

Aim: To study the multimessenger nature of the signal that can result from the phase transition of a neutron star to a quark star and their corresponding astrophysical observations. Methods: The phase transition process is initiated by the abrupt pressure and density changes at the star center, giving rise to a shock which deconfines matter followed by a weak front converting excess down to strange quarks to attain absolute stability. This process's effects are investigated by understanding how the energy escapes from the star in the form of neutrino-antineutrino annihilation. For such annihilation process, the corresponding energy deposition rate is calculated. Structural changes due to the energy loss have been investigated in the likes of misalignment angle evolution of the star and its astrophysical observation through gravitational waves. Results: The energy and time signature for the neutrino-antineutrino annihilation is compared with the observed isotropic energy for a short gamma-ray burst. The misalignment angle evolves to align the star's tilt axis, which can lead to the sudden increase or decrease of radio intensity from the pulsar. The corresponding gravitational wave emission, both continuous and burst, all lead towards multimessenger signals coming from the phase transition.

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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