中子星周围强引力场中的准周期振荡检验膜世界模型
Quasiperiodic oscillations in a strong gravitational field around neutron stars testing braneworld models
摘要：
brany宇宙中中子星的强引力场可以用球对称解来描述，brany星外部的度规是Reissner-Nordstrom型的，其中包含brany潮汐荷，代表了体时空对恒星结构的潮汐效应。研究了在中子星双星系统中观测到的高频准周期振荡（QPO）轨道模型中潮汐荷的作用。我们主要讨论相对论性的旋进模型。我们给出了开普勒（垂直）和径向周转振荡的频率的径向轮廓。我们展示了如何修改的标准相对论性岁差模型的潮汐电荷适合的观测数据，给出的允许值的潮汐电荷和膜张力的基础上的过程去附近的中子星的估计。我们比较了强场制度的限制与太阳系实验中的弱场限制。
英文摘要：
The strong gravitational field of neutron stars in the brany universe could be described by spherically symmetric solutions with a metric in the exterior to the brany stars being of the Reissner-Nordstrom type containing a brany tidal charge representing the tidal effect of the bulk spacetime onto the star structure. We investigate the role of the tidal charge in orbital models of high-frequency quasiperiodic oscillations (QPOs) observed in neutron star binary systems. We focus on the relativistic precession model. We give the radial profiles of frequencies of the Keplerian (vertical) and radial epicyclic oscillations. We show how the standard relativistic precession model modified by the tidal charge fits the observational data, giving estimates of the allowed values of the tidal charge and the brane tension based on the processes going in the vicinity of neutron stars. We compare the strong field regime restrictions with those given in the weak-field limit of solar system experiments.
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