Most astrophysical accretion disks are likely to be warped. In X-ray binaries, the spin evolution of an accreting neutron star is critically dependent on the interaction between the neutron star magnetic field and the accretion disk. There have been extensive investigations on the accretion torque exerted by a coplanar disk that is magnetically threaded by the magnetic field lines from the neutron stars, but relevant works on warped/tilted accretion disks are still lacking. In this paper we develop a simplified two-component model, in which the disk is comprised of an inner coplanar part and an outer, tilted part. Based on standard assumption on the formation and evolution of the toroidal magnetic field component, we derive the dimensionless torque and show that a warped/titled disk is more likely to spin up the neutron star compared with a coplanar disk. We also discuss the possible influence of various initial parameters on the torque.

大多数天体吸积盘都可能发生扭曲。在 X 射线双星中，吸积中子星的自旋演化严重依赖于中子星磁场和吸积盘之间的相互作用。已经对由中子星的磁力线产生磁性的共面盘施加的吸积扭矩进行了广泛的研究，但仍然缺乏关于翘曲/倾斜吸积盘的相关工作。在本文中，我们开发了一个简化的双分量模型，其中圆盘由一个内部共面部分和一个外部倾斜部分组成。基于对环形磁场分量的形成和演化的标准假设，我们推导出无量纲扭矩，并表明与共面圆盘相比，扭曲/有标题的圆盘更有可能旋转中子星。我们还讨论了各种初始参数对扭矩的可能影响。