发表机构
School of Physics and Astronomy, China West Normal University; Universidade Federal de Campina Grande（西华师范大学物理与天文学院; 坎皮纳格兰德联邦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过模拟旋转膜世界黑洞周围吸积流的偏振同步辐射，分析了潮汐电荷和自旋对偏振图像的影响，并提出了利用偏振观测量约束膜世界潮汐电荷的途径。
AI 中文摘要
我们研究了围绕旋转膜世界黑洞的光学薄吸积流产生的偏振同步辐射，重点关注高维引力如何修改光子传播和偏振输运。我们积分了偏振四矢量的零测地线和平行输运方程，并在共同的发射率和磁场设定下，考察了潮汐电荷、黑洞自旋、观测者倾角以及顺行或逆行轨道运动的影响。我们分析了线偏振强度、电矢量位置角（EVPA）、斯托克斯参数、联合$Q$--$U$偏振态空间以及累积净线偏振度，并将代表性膜世界构型与Kerr和Kerr--Newman时空进行了比较。在所考虑的参数范围内，潮汐电荷和自旋并未产生定性上新的尺度偏振形态。相反，它们主要重新组织了阴影边界和光子环附近强场区域中的偏振强度、取向和偏振态分布。观测倾角控制着主要的投影形态，而高倾角增强了投影和多普勒不对称性，并使顺行与逆行流动之间的区别更加明显。斯托克斯分量及其联合态空间揭示了在强度图像中不太明显的局部弯曲、拉伸和轨迹集中。累积净线偏振度随累积半径的增加而降低，对于所考虑的代表性模型，较大的潮汐电荷或自旋会降低其幅度。这些互补的偏振观测量共同提供了一条潜在途径，用于区分时空、观测几何和吸积流效应，并利用视界尺度偏振测量来约束膜世界潮汐电荷。
英文摘要
We investigate polarized synchrotron emission from an optically thin accretion flow around a rotating braneworld black hole, focusing on how higher-dimensional gravity modifies photon propagation and polarization transport. We integrate the null-geodesic and parallel-transport equations for the polarization four-vector and, within a common emissivity and magnetic-field prescription, examine the effects of tidal charge, black-hole spin, observer inclination, and prograde or retrograde orbital motion. We analyze the linearly polarized intensity, electric-vector position angle (EVPA), Stokes parameters, the joint $Q$--$U$ polarization-state space, and the cumulative net linear polarization degree, and compare representative braneworld configurations with Kerr and Kerr--Newman spacetimes. Within the parameter range considered, tidal charge and spin do not generate a qualitatively new large-scale polarization morphology. Instead, they primarily reorganize the polarized intensity, orientation, and polarization-state distribution in the strong-field region near the shadow boundary and photon ring. Viewing inclination controls the dominant projected morphology, while high inclinations enhance projection and Doppler asymmetries and make the distinction between prograde and retrograde flows more pronounced. The Stokes components and their joint state space expose local bending, stretching, and trajectory concentration that are less apparent in intensity images. The cumulative net linear polarization degree decreases with increasing cumulative radius, and larger tidal charge or spin lowers its amplitude for the representative models considered. Together, these complementary polarization observables provide a potential route for separating spacetime, viewing-geometry, and accretion-flow effects and for constraining braneworld tidal charge with horizon-scale polarimetry.
