M. Ghasemi-Nodehi, Mustapha Azreg-Aïnou, Kimet Jusufi, Mubasher Jamil
In this paper we study the shadow of rotating Kaluza-Klein (KK) black holes and the connection between the shadow radius and the real part of quasi-normal modes (QNMs) in the eiokonal limit. In addition we have explored the quasi-periodic oscillations (QPOs) in the rotating KK black hole.
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We study the scalar perturbation in the background of the charged Kaluza-Klein black holes with squashed horizons. We find that the position of infinite discontinuities of the heat capacities can be reflected in quasinormal spectrum. This shows the possible non-trivial relation between the thermodynamical and dynamical properties of black holes.
We study the quasinormal modes of scalar perturbation in the background of five-dimensional charged Kaluza-Klein black holes with squashed horizons immersed in the Gödel universe. Besides the influence due to the compactness of the extra dimension, we disclose the cosmological rotational effect in the wave dynamics. The wave behavior affected by the Gödel parameter provides an interesting insight into the Gödel universe.
In this paper we focus on the relation between quasinormal modes (QNMs) and a rotating black hole shadows. As a specific example, we consider the quantum deformed Kerr black hole obtained via Newman--Janis--Azreg-A\"ınou algorithm. In particular, using the geometric-optics correspondence between the parameters of a QNMs and the conserved quantities along geodesics, we show that, in the eikonal limit, the real part of QNMs is related to the Keplerian frequency for equatorial orbits. To this end, we explore the typical shadow radius for the viewing angles, $θ_0=π/2$, and obtained an interesting …
In this article, we study the particle dynamics around a static and spherically symmetric Bardeen-Kiselev black hole (BK BH) which is a solution of the Einstein-non-linear Maxwell field equations along with a quintessential field. We discuss its essential geometrical properties such as scalar invariants and size of innermost stable circular orbits. Dynamics of test particles around the BH is also studied. Moreover, we also computed the fundamental frequencies of a test particle orbiting the BH in a slightly perturbed orbit. Further, the degeneracy relations between the spin of rotating Kerr BH…
In this paper we obtain an effective metric describing a regular and rotating magnetic black hole (BH) solution with a Yang-Mills electromagnetic source in Einstein-Yang-Mills (EYM) theory using the Newman--Janis algorithm via the non-complexification radial coordinate procedure. We then study the BH shadow and the quasinormal modes (QNMs) for massless scalar and electromagnetic fields and the quasiperiodic oscillations (QPOs). To this end, we also study the embedding diagram for the rotating EYM BH. The energy conditions, shadow curvature radius, topology and the dynamical evolution of scalar…
In this paper, we investigate thermodynamics and phase transitions of a 4-dimensional rotating Kaluza-Klein black hole solution in the presence of Maxwell electrodynamics. Calculating the conserved and thermodynamical quantities shows that the first law of thermodynamics is satisfied. To find the stable black hole' s criteria, we check the stability in the canonical ensemble by analyzing the behavior of the heat capacity. We also consider a massive scalar perturbation minimally coupled to the background geometry of the 4-dimensional static Kaluza-Klein black hole and investigate the quasinorma…
Quasinormal modes and echoes of a double braneworld
研究双膜世界的准正常模和回声，揭示其与单膜模型的不同特性及长寿命卡鲁扎-克莱因重子的寿命延长现象。
Lightcone fluctuations in a five dimensional Kaluza-Klein model and an estimation on the size of the extra dimension
本研究针对五维Kaluza-Klein模型中准周期紧致化引发的光锥涨落问题，计算了重整化引力子两点函数与光子飞行时间偏移，基于詹姆斯·韦伯望远镜NIRSpec的灵敏度探讨了额外维尺度的观测估计方法，并对比了不同准周期参数下的估计差异。
Quasinormal modes of tensor perturbation in Kaluza-Klein black hole for Einstein-Gauss-Bonnet gravity
研究爱因斯坦-高斯-邦尼重力中卡鲁扎-克莱因黑洞张量扰动的准正常模式，通过数值方法计算频率并分析参数影响。
Sound from extra dimension: quasinormal modes of thick brane
本文研究了厚膜系统的正则模，通过求解张量微扰的类薛定谔方程和波包数值演化，发现厚膜存在一组离散正则模，表现为衰变大质量引力子并反映厚膜结构。
Probing the Charged Hayward Black Hole in Dark Matter and String Cloud Environments through Shadow, Geodesics, and Quasinormal Spectrum
研究通过阴影、测地线和准正常谱分析带电Hayward黑洞在暗物质和弦云环境中的特性，探讨参数对观测信号的影响。
Two-scalar-field $f(R)$ Thick Branes, Gravitational Resonances and Quasinormal Modes
本文研究 $f(R)$ 引力中由双标量场支撑的厚膜世界，通过分析张量扰动谱和准正则模，发现无鬼分支中不存在窄共振，而有鬼分支中的尖峰源于奇异边界而非平滑背景。
Quasinormal modes of scalar perturbations in Rastall thick brane
研究拉斯特尔引力中五维厚膜模型引力标量扇区的准正则模，通过特定解推导主方程并简化为本征值问题，用多种方法计算复准正则频率，揭示其与\(\lambda\)的关系及微扰晚期行为，为探测修正引力提供观测特征。
Black holes surrounded by massive vector fields in Kaluza-Klein gravity
本文构造KK引力中含黑洞—大质量矢量场相互作用的精确黑洞解，分析其电荷模拟效应、吸积盘、QNMs与稳定性，并用EHT对Sgr A*的观测约束参数。
Black holes and nilmanifolds: quasinormal modes as the fingerprints of extra dimensions?
本研究针对超出标准模型领域中负里奇曲率高维研究的空白，以含三维幂零流形的史瓦西黑洞乘积空间为对象，将额外维几何转化为QNM有效势的类质量平方项，用三种数值方法算出QNM谱并确定了KK质量的QNM可探测边界，为利用准正模搜寻额外维特征提供了参考。
Graviscalar quasinormal modes and asymptotic tails of a thick brane
本研究通过多种方法分析了厚膜的引力标量准正常模及其尾部行为，揭示了其作为引力波背景可能的来源。
In this paper we study the effect of the Generalized Uncertainty Principle (GUP) on the shadow of GUP-modified Kerr black hole and the correspondence between the shadow radius and the real part of the quasinormal modes (QNMs). We find that the shadow curvature radius of the GUP-modfied Kerr black hole is bigger compared to the Kerr vacuum solution and increases linearly monotonically with the increase of the GUP parameter. We then investigate the characteristic points of intrinsic curvature of the shadow from a topological point of view to calculate the the angular size for these curvature rad…
The pseudospectrum and transient of Kaluza-Klein black holes in Einstein-Gauss-Bonnet gravity
本文在伪谱框架下研究爱因斯坦-高斯-博内引力中Maeda-Dadhich黑洞张量扰动的谱不稳定性与动力学不稳定性，引入复稳定半径连接二者，并揭示演化算子能量范数的瞬态增长。
Model-independent search for the quasinormal modes of gravitational wave echoes
本研究针对引力波回波检测中波形理论不确定性大的问题，引入相对相位信息优化贝叶斯搜索算法，提出不依赖模型的频率域QNMs搜索策略，经多基准和高斯噪声验证有效，为量子黑洞地震学提供新方法。
Nonradial stability of topological stars
本文通过线性稳定性分析，数值证明了五维爱因斯坦-麦克斯韦理论中拓扑星在零Kaluza-Klein动量下对非径向扰动是稳定的，为其作为黑洞微态几何候选者提供了支持。
Three-dimensional simulations for the merger of binary neutron stars (BNSs) are performed in the framework of full general relativity. We pay particular attention to the black hole (BH) formation case and to the resulting mass of the surrounding disk for exploring possibility for formation of the central engine of short-duration gamma-ray bursts. Hybrid equations of state (EOSs) are adopted mimicking realistic, stiff nuclear EOSs, for which the maximum allowed gravitational mass of cold and spherical neutron stars (NSs), M_sph, is larger than 2M_sun. For the simulations, we focus on BNSs of th…
The recent birth of gravitational wave astronomy invites a new generation of precision tests of general relativity. Signatures of black hole (BH) mergers must be systematically explored in a wide spectrum of modified gravity theories. Here, we turn to one such theory in which the initial value problem for BH mergers is well posed, the Einstein-Maxwell-dilaton system. We present conservative estimates for the merger parameters (final spins, quasinormal modes) based on techniques that have worked well for ordinary gravity mergers and utilize information extracted from test particle motion in the…
Recently introduced exact solution of the Einstein gravity coupled minimally to an anisotropic fluid representing dark matter can well represent supermassive black holes in galactic nuclei with realistic distribution of dark matter around the black hole, given by the Hernquist-like density distribution. For these fluid-hairy black hole spacetimes, properties of the gravitational radiation, quasinormal ringing, and optical phenomena were studied, giving interesting results. Here, using the range of physical parameters of these spacetimes allowing for their relevance in astrophysics, we study th…
The Great Impersonation: $\mathcal{W}$-Solitons as Prototypical Black Hole Microstates
研究提出$\mathcal{W}$-孤子作为黑洞微状态原型，通过分析其光子球和扰动特性，揭示其与黑洞的相似性和差异，为引力波观测提供新的理论依据。
Quantum-Corrected Thermodynamics, Dirac Perturbations, Geodesic Structure, and Topological Phases of Black Holes with Non-Minimal Logarithmic Coupling
研究非最小对数耦合修正的爱因斯坦 - 麦克斯韦理论中黑洞性质，用费米子隧穿等方法获霍金温度等，构建量子几何修正相空间并表征拓扑相结构，发现有效压力在拓扑缺陷线消失，关联压力与局部稳定性。
Simpson-Visser regularization of the quantum Oppenheimer-Snyder-Datt black hole
该研究将 Simpson-Visser 正则化应用于量子 Oppenheimer-Snyder-Datt 黑洞，系统分析了其几何、轨道、热力学及准正则模，揭示了参数对观测量的不同约束作用及拓扑荷的改变。
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