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arXiv 2403.01006gr-qcastro-ph.HE
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发光中子星周围的粒子运动:偏离史瓦西时空的影响

Particle motion around luminous neutron stars: effects of deviation from Schwarzschild spacetime

Ronaldo S. S. Vieira, Maciek Wielgus

AI总结:

本文研究发光中子星周围测试粒子在引力与辐射共同作用下的轨迹,将史瓦西时空中的爱丁顿俘获球面推广到一般静态球对称时空,并通过Reissner-Nordström和Kehagias-Sfetsos时空示例说明,指出未来可利用X射线暴观测检验强场引力理论。

摘要:

我们研究发光、静态、球对称中子星周围的测试粒子在引力和辐射共同影响下的轨迹。在广义相对论中,对于史瓦西时空,当光度接近爱丁顿光度时会形成一个平衡球面(爱丁顿俘获球面)。我们将这些结果推广到一类广泛的静态球对称时空。我们还研究了球对称时空中强辐射场下粒子的动力学。结果通过两个例子加以说明:广义相对论中带电球体的Reissner-Nordström时空,以及源自Horava-Lifshitz引力理论的Kehagias-Sfetsos时空。我们的发现适用于引力场方程不同于广义相对论真空爱因斯坦场方程的中子星,例如在修改引力理论中,唯一的要求是测试粒子在无辐射场时遵循测地线运动。我们所描述的效应原则上可以通过中子星X射线暴的观测来测量。因此,未来的详细研究可以利用这类观测来检验强场区域的引力理论,前提是时空几何的影响能够与天体物理不确定性区分开来。

英文摘要:

We study trajectories of test particles around a luminous, static, spherically symmetric neutron star, under the combined influence of gravity and radiation. In general relativity, for Schwarzschild spacetime, an equilibrium sphere (the Eddington Capture Sphere) is formed for near-Eddington luminosities. We generalize these results to a broad class of static, spherical spacetimes. We also study the dynamics of particles in a strong radiation field in spherical spacetimes. The results are illustrated for two cases, Reissner-Nordström spacetime of a charged spherical object in general relativity and Kehagias-Sfetsos spacetime, arising from the Horava-Lifshitz gravity theory. Our findings apply to neutron stars under gravitational field equations different from the vacuum Einstein field equations of general relativity, such as in modified theories of gravity, the only requirement being that test particles follow geodesics in the absence of the radiation field. The effects that we describe are, in principle, measurable through observations of X-ray bursts of neutron stars. Hence, detailed future studies could use such observations to test gravity theories in the strong-field regime, provided that the impact of the spacetime geometry can be disentangled from the astrophysical uncertainties.

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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