Shadows and optical appearances of black holes in R2 gravity

IF 4.2 3区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astroparticle Physics Pub Date : 2025-03-01 DOI:10.1016/j.astropartphys.2025.103100

Khadije Jafarzade , Sanjar Shaymatov , Mubasher Jamil

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引用次数: 0

Abstract

In this paper, we consider a charged AdS/dS black hole (BH) in

R^{2}

gravity and study its optical features, including the shadow’s geometrical shape and the energy emission rate. Additionally, we look for criteria to restrict the free parameters of the theory by comparing them to observational data of M87

^{⋆}

. Then, we employ the Newman-Janis algorithm to build the rotating counterpart of the static solution in

R^{2}

gravity and calculate the energy emission rate for the rotating case as well as discuss how the rotation factor and other parameters of this theory affect the emission of particles around the BHs. In the following, we consider the obtained rotating BH as a supermassive black hole and evaluate the parameters of the model with shadow size estimates based on the observations of M87

^{⋆}

from EHT.

查看原文本刊更多论文

R2重力下黑洞的阴影和光学外观

本文研究了R2重力下带电AdS/dS黑洞（BH）的光学特征，包括阴影的几何形状和能量发射率。此外，我们通过比较M87 -百科的观测数据来寻找限制理论自由参数的标准。然后，我们利用Newman-Janis算法建立了R2重力下静态解的旋转对应体，计算了旋转情况下的能量发射率，并讨论了该理论的旋转因子和其他参数如何影响黑洞周围粒子的发射。在下文中，我们将获得的旋转黑洞视为超大质量黑洞，并根据EHT对M87 - -的观测结果估计阴影大小来评估模型的参数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astroparticle Physics 地学天文-天文与天体物理

CiteScore

8.00

自引率

2.90%

发文量

审稿时长

79 days

期刊介绍： Astroparticle Physics publishes experimental and theoretical research papers in the interacting fields of Cosmic Ray Physics, Astronomy and Astrophysics, Cosmology and Particle Physics focusing on new developments in the following areas: High-energy cosmic-ray physics and astrophysics; Particle cosmology; Particle astrophysics; Related astrophysics: supernova, AGN, cosmic abundances, dark matter etc.; Gravitational waves; High-energy, VHE and UHE gamma-ray astronomy; High- and low-energy neutrino astronomy; Instrumentation and detector developments related to the above-mentioned fields.