Exploring perfect fluid dark matter with EHT results of Sgr A* through rotating 4D-EGB black holes

IF 5 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Physics of the Dark Universe Pub Date : 2024-08-26 DOI:10.1016/j.dark.2024.101625

Farruh Atamurotov , Furkat Sarikulov , Sushant G. Ghosh , G. Mustafa

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Abstract

We investigate the rotating 4D Gauss–Bonnet (GB) black holes surrounded by Perfect Fluid Dark Matter (PFDM) using the Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*). This rotating black hole, influenced by an additional GB parameter $α$ and a DM parameter $β$ , deviates from the Kerr black hole geometry, offering a more complex horizon structure. Our findings reveal that the shadow size decreases and oblateness increases with higher values of $α$ , $β$ , and the spin parameter $a$ . By plotting the shadow area $A$ and oblateness $D$ as functions of $α$ and $β$ for various $a$ values, we determine the unique black hole parameters through the intersection points of the $A$ and $D$ curves. We constrain the GB and DM parameters with the EHT shadow observational results of Sgr A* for an inclination angle of 90° and 50°. The results, which align with EHT observations of Sgr A*, suggest that dark matter may exist in significant quantities around the galactic centre, challenging the traditional Kerr black hole model and offering new avenues for understanding complex interactions. Thus, It is essential to consider that rotating 4D GB black holes surrounded by PFDM could be strong candidates for astrophysical black holes.

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通过旋转 4D-EGB 黑洞，利用 Sgr A* 的 EHT 结果探索完美流体暗物质

我们利用事件视界望远镜（EHT）对人马座A*（Sgr A*）的观测，研究了被完美流体暗物质（PFDM）包围的旋转4D高斯-本内特（GB）黑洞。这个旋转黑洞受到额外的 GB 参数 α 和 DM 参数 β 的影响，偏离了克尔黑洞的几何形状，提供了一个更加复杂的视界结构。我们的研究结果表明，随着α、β和自旋参数a值的增大，阴影面积减小，扁圆度增大。通过绘制阴影面积A和扁圆度D在不同a值下与α和β的函数关系图，我们通过A和D曲线的交点确定了独特的黑洞参数。我们用 Sgr A* 在 90° 和 50° 倾角下的 EHT 阴影观测结果来约束 GB 和 DM 参数。这些结果与 EHT 对 Sgr A* 的观测结果一致，表明暗物质可能大量存在于星系中心周围，对传统的克尔黑洞模型提出了挑战，并为理解复杂的相互作用提供了新的途径。因此，必须考虑到被PFDM包围的旋转4D GB黑洞可能是天体物理黑洞的有力候选者。

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来源期刊

Physics of the Dark Universe ASTRONOMY & ASTROPHYSICS-

CiteScore

9.60

自引率

7.30%

发文量

118

审稿时长

61 days

期刊介绍： Physics of the Dark Universe is an innovative online-only journal that offers rapid publication of peer-reviewed, original research articles considered of high scientific impact. The journal is focused on the understanding of Dark Matter, Dark Energy, Early Universe, gravitational waves and neutrinos, covering all theoretical, experimental and phenomenological aspects.