发表机构
Universidade Federal do Ceará; Center of Gravitation and Fundamental Metrology, Rostest; Peoples’ Friendship University of Russia; National Research Nuclear University ”MEPhI”（塞阿拉联邦大学; 引力与基本计量中心，罗斯特斯特; 俄罗斯人民友谊大学; 国立核研究大学莫斯科工程物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出从无质量虫洞构造有质量黑洞弹跳的通用框架，发现广义Bardeen-like时空具有多重光环，其阴影与EHT观测Sgr A*兼容，但当前分辨率下与标准黑洞存在观测简并。
AI 中文摘要
我们开发了一个通用框架，通过引入依赖于位置的质量函数，同时保持底层面积-半径剖面不变，从无质量虫洞种子构造有质量黑洞弹跳几何。我们将此方法应用于广义Ellis-Bronnikov虫洞，获得了一族新的广义Bardeen-like黑洞弹跳时空，该时空连续插值于可穿越虫洞和规则黑洞之间。我们研究了有质量粒子和光子的运动，并表明，与无质量广义Ellis-Bronnikov几何的较简单轨道结构相比，广义Bardeen-like时空可以表现出多个圆轨道和丰富的光环结构，包括由两个不稳定圆光子轨道被一个稳定轨道分隔的构型。我们确定了相应的光子球和阴影半径，并将我们的预测与事件视界望远镜对Sgr A*的观测进行比较，推导出模型参数空间的观测约束。我们进一步通过光线追踪研究了由几何和光学薄吸积盘产生的光学外观。多重光环在高分辨率强度剖面中产生特征性的嵌套结构，其相对亮度受到质量形变和引力红移的强烈影响。然而，在对EHT的有限角分辨率进行高斯束卷积建模后，这些精细结构大部分被抹去，揭示了在当前EHT分辨率下，这些奇异致密天体与标准黑洞几何之间存在强烈的观测简并性。
英文摘要
We develop a general framework for constructing massive black bounce geometries from massless wormhole seeds by introducing a position-dependent mass function while preserving the underlying areal-radius profile. We apply this procedure to the generalized Ellis-Bronnikov wormhole and obtain a new family of generalized Bardeen-like black bounce space-times, which continuously interpolates between traversable wormholes and regular black holes. We investigate the motion of massive particles and photons and show that, in contrast with the simpler orbital structure of the massless generalized Ellis-Bronnikov geometry, the generalized Bardeen-like space-time can exhibit multiple circular orbits and a rich light ring structure, including configurations with two unstable circular photon orbits separated by a stable one. We determine the corresponding photon sphere and shadow radii and compare our predictions with Event Horizon Telescope observations of Sgr A*, deriving observational constraints on the parameter space of the model. We further investigate the optical appearance produced by a geometrically and optically thin accretion disk through ray tracing. Multiple light rings generate characteristic nested structures in the high-resolution intensity profiles, whose relative brightness is strongly affected by the mass deformation and gravitational redshift. However, after modeling the finite angular resolution of the EHT with a Gaussian beam convolution, these fine structures are largely washed out, revealing a strong observational degeneracy between these exotic compact objects and standard black hole geometries at current EHT resolution.
Comments35 pages, 28 figures. Comments are welcome
