论文标题
黑洞阴影上使用球形积聚的暗物质的烙印
Imprints of Dark Matter on Black Hole Shadows using Spherical Accretions
论文作者
论文摘要
我们研究了从银河中心鉴定暗物质的可能性，该暗物质是从围绕静态和球形对称黑洞周围的光学薄磁盘区域发出的电磁辐射的物理特性。特别是，我们考虑了光学薄磁盘区域的两个特定模型：静止的气体和径向自由下落的气体。由于暗物质对时空几何形状的影响，我们发现暗物质可以根据暗物质模型增加或降低电磁通量辐射的强度。为此，我们分析了两个具有不同质量功能的简单暗物质模型$ \ MATHCAL {m}（r）$，带有物质质量$ m $，厚度$Δr_s$以及黑孔周围的暗物质核心半径。除此之外，我们还探索了黑洞周围完美的液体暗物质的情况。我们表明，为了使暗物质对电磁通量辐射的强度产生重大影响，需要在黑洞附近的暗物质的高能量密度。我们还发现，周围的暗物质分布在阴影半径和电磁通量辐射的强度上起着关键作用。最后，我们使用了阴影半径和准模式（QNM）之间的关系来计算QNM频率的实际部分。
We study the possibility of identifying dark matter in the galactic center from the physical properties of the electromagnetic radiation emitted from a optical-thin disk region around a static and spherically symmetric black hole. In particular, we consider two specific models for the optical-thin disk region: a gas at rest and a gas in a radial free fall. Due to the effect of dark matter on the spacetime geometry, we find that the dark matter can increase or decrease the intensity of the electromagnetic flux radiation depending on the dark matter model. To this end, we analyze two simple dark matter models having different mass functions $\mathcal{M}(r)$, with a matter mass $M$, thickness $Δr_s$ along with a dark matter core radius surrounding the black hole. In addition to that, we explore the scenario of a perfect fluid dark matter surrounding the black hole. We show that in order to have significant effect of dark matter on the intensity of the electromagnetic flux radiation, a high energy density of dark matter near the black hole is needed. We also find that the surrounding dark matter distribution plays a key role on the shadow radius and the intensity of the electromagnetic flux radiation, respectively. Finally, we have used the relation between the shadow radius and the quasinormal modes (QNMs) to compute the real part of QNM frequencies.
