标题： 成像具有热点和薄吸积盘的紧致玻色子星 显示英文标题

标题： Imaging compact boson stars with hot-spots and thin accretion disks

摘要： 在本工作中，我们考虑了由各向同性发光（热点）源和光学薄吸积盘环绕的具有自相互作用的致密玻色星的观测特性。 我们考虑了由四次方和六次方自相互作用势支持的两类玻色星，并选择了每类具有逐渐增大的致密性的三个样本；只有那些致密性足够大的才能维持光环，即零轨道。 对于热点，使用倾斜角$\theta=\{20^\circ, 50^\circ, 80^\circ \}$，我们发现光子穿过玻色星内部的二次轨迹穿透图像，如果星体足够致密，该图像可以进一步分解为额外的图像。 对于吸积盘，我们发现后一类星体实际上显示出与热点分析一致的额外二次图像序列，这一特征在典型的黑洞时空环境中不存在。 此外，我们还发现，在轴向观测以及在倾斜角较高的情况下，这些星体中的一些呈现出类似阴影的中心亮度凹陷。 我们讨论了这些发现，以说明玻色星在光学外观上有效充当黑洞替代物的能力以及潜在的观测鉴别特征。 显示英文摘要

摘要： In this work we consider the observational properties of compact boson stars with self-interactions orbited by isotropically emitting (hot-spot) sources and optically thin accretion disks. We consider two families of boson stars supported by quartic and sixth-order self-interaction potentials, and choose three samples of each of them in growing compactness; only those with large enough compactness are capable to hold light-rings, namely, null bound orbits. For the hot-spots, using inclination angles $\theta=\{20^\circ, 50^\circ, 80^\circ \}$ we find a secondary track plunge-through image of photons crossing the interior of the boson star, which can be further decomposed into additional images if the star is compact enough. For accretion disks we find that the latter class of stars actually shows a sequence of additional secondary images in agreement with the hot-spot analysis, a feature absent in typical black hole space-times. Furthermore, we also find a shadow-like central brightness depression for some of these stars in both axial observations and at the inclination angles above. We discuss our findings in relation to the capability of boson stars to effectively act as black hole mimickers in their optical appearances as well as potential observational discriminators.