论文标题
SGR的阴影和光子环的超级演变A $^\ star $
Superradiant evolution of the shadow and photon ring of Sgr A$^\star$
论文作者
论文摘要
超轻的玻色子可以通过超级不稳定性影响旋转黑洞（BHS）的动力学，这可以导致超大质量BH阴影的时间演变。我们正在研究目睹超级诱导的BH阴影演化的前景，考虑到超轻矢量和张量场。我们介绍了对阴影时间进化敏感的两个可观察到的物品：阴影漂移以及与光子环自相关相关的方位角角度的变化。根据观察者的倾斜角度，这两个可观察物被证明是高度互补的。我们表明的是，关注超级不稳定性的超级不稳定性的超级质量sgr a $^\ star $在人类的时间尺度上可以明显变化10^{ - 17} \，{\ rm ev} $质量范围。
Ultralight bosons can affect the dynamics of spinning black holes (BHs) via superradiant instability, which can lead to a time evolution of the supermassive BH shadow. We study prospects for witnessing the superradiance-induced BH shadow evolution, considering ultralight vector and tensor fields. We introduce two observables sensitive to the shadow time-evolution: the shadow drift, and the variation in the azimuthal angle lapse associated to the photon ring autocorrelation. The two observables are shown to be highly complementary, depending on the observer's inclination angle. Focusing on the supermassive object Sgr A$^\star$ we show that both observables can vary appreciably over human timescales of a few years in the presence of superradiant instability, leading to signatures which are well within the reach of the Event Horizon Telescope for realistic observation times (but benefiting significantly from extended observation periods), and paving the way towards probing ultralight bosons in the $\sim 10^{-17}\,{\rm eV}$ mass range.
