论文标题
标量张量理论中的中子恒星积聚磁盘的铁线
Iron Line from Neutron Star Accretion Disks in Scalar Tensor Theories
论文作者
论文摘要
6.4 keV处的FeK_α荧光线是在积聚紧凑物体附近的时空度量标准的强大探针。我们在这里调查了一些替代性重力理论，即标量张量理论，这些理论会引起非最低耦合标量场的存在并预测强烈标量的中子星的存在，从而改变了相对于一般相对性的预期线形状。通过考虑到Fe线起源的积聚磁盘的一般相对论轨道动力学的两个偏差以及中性星周围光传播的变化，我们计算了磁盘相对于观察者的各种倾向的线形状。我们发现，低能尾部的强度和线路的高能边缘的位置变化。此外，我们验证了即使这些更改的总数为几个百分之几的顺序，也可以观察到下一代X射线卫星。
The Fe K_αfluorescent line at 6.4 keV is a powerful probe of the space-time metric in the vicinity of accreting compact objects. We investigated here how some alternative theories of gravity, namely Scalar tensor Theories, that invoke the presence of a non-minimally coupled scalar field and predict the existence of strongly scalarized neutron stars, change the expected line shape with respect to General Relativity. By taking into account both deviations from the general relativistic orbital dynamics of the accreting disk, where the Fe line originates, and the changes in the light propagation around the neutron star, we computed line shapes for various inclinations of the disk with respect to the observer. We found that both the intensity of the low energy tails and the position of the high energy edge of the line change. Moreover we verified that even if those changes are in general of the order of a few percent, they are potentially observable with the next generation of X-ray satellites.
