104 citations · 512 across the 35 of their papers we have counts for
23 papers · 1 filter
Testing charged Simpson-Visser-AdS spacetimes with twin-peak QPOs
Saeed Ullah Khan, Javlon Rayimbaev, Muhammad Zahid +3
In this manuscript, we study circular geodesics and twin-peak high-frequency quasi-periodic oscillations (HF-QPOs) in the charged Simpson--Visser--anti-de Sitter (AdS) spacetime, w…
Elementary-Symmetric Ricci Gravity: Metric Formulation
Xingpao Suo, Dianxu Ma, Yuqiong Shan +1
We investigate a four-dimensional metric theory of gravity whose Lagrangian is a linear combination of the elementary symmetric polynomials of the Ricci tensor. We derive the field…
Quasibound states of charged Dirac fields around Einstein-Euler-Heisenberg black holes
Nodirbek Anarboev, Javlonbek Khasanov, Javlon Rayimbaev +1
We study quasibound states of a massive charged Dirac field on the Einstein--Euler--Heisenberg (EEH) black hole, the extension of Reissner--Nordström (RN) by the leading weak-field…
Boundary-induced corrections to the response of an Unruh-DeWitt detector outside a compact star with Robin surface conditions
Nodirbek Anarboev, Javlonbek Khasanov, Javlon Rayimbaev +1
We formulate the finite-time response problem for a radially accelerated Unruh--DeWitt detector coupled to a real massless scalar field outside a static, spherically symmetric, hor…
Charged Simpson-Visser-AdS spacetime: QPOs and observational constraints
Saeed Ullah Khan, Javlon Rayimbaev, Muhammad Zahid +3
In this article, we examine particle dynamics and Quasi-periodic oscillations within a charged Simpson-Visser-Anti-de Sitter (AdS) spacetime. We first analyze the behavior of the m…
Ringdown and greybody signatures of rational regular black holes in non-polynomial gravity
Shohzod Jumaniyozov, Javlon Rayimbaev, Azam Payzullaev +3
We study the quasinormal mode spectrum and wave-scattering properties of the four-dimensional rational regular black hole recently obtained in non-polynomial (quasi-topological) gr…
Rotating black holes surrounded by PFDM in STVG: Shadows and eikonal quasinormal modes
Muhammad Zahid, Zhiling Liu, Saeed Ullah Khan +1
We investigate the optical and dynamical properties of a rotating black hole in scalar--tensor--vector gravity (STVG) surrounded by perfect fluid dark matter (PFDM). Starting from…
Pulsar magnetospheres in dynamical Chern-Simons gravity: deathline conditions and polar-cap particle acceleration
Sherzod Sayfiyev, Bobomurat Ahmedov, Chengxun Yuan +3
The role of surface gravity in neutron stars (NSs) is considerable in the radiation mechanisms of the surrounding plasma magnetosphere near the star surface, as they are highly mag…
Charged particles and QPO constraints in tidal charge black hole magnetosphere sourced by a current loop
Ozodbek Abdurakhmonov, Javlon Rayimbaev, Inomjon Ibragimov +3
We investigate the dynamics of charged particles in the dipolar electromagnetic field generated by a stationary current loop around a static black hole in the Randall--Sundrum bran…
Energy-momentum-squared gravity: charged quark star solutions with unified interacting matter
Ayan Banerjee, Bobur Turimov, Javlon Rayimbaev +3
We investigate the equilibrium structure of electrically charged quark stars within the framework of energy-momentum-squared gravity (EMSG), adopting a unified interacting quark-ma…
Probing black holes surrounded by Dust field in Quantum Fluctuation Modified Gravity with twin-peak QPOs
Kamola Shermatova, Qodir Badalov, Abubakir Shermatov +5
We study a static, spherically symmetric black hole solution surrounded by a dust field within quantum fluctuation modified gravity, in which the quantum-fluctuation parameter …
Kerr-referenced analytical parametrization of rotating black holes in dynamical Chern-Simons gravity
Sardor Murodov, Bahodir Ahmedov, Bekzod Rahmatov +2
Rotating black holes in dynamical Chern-Simons gravity are known nonperturbatively mainly through numerical solutions, which limits their direct use in strong-field applications. W…
Weakly nonlinear strong-field signatures of spontaneously vectorized Einstein-vector-Gauss-Bonnet black holes near the Schwarzschild bifurcation
Sardor Murodov, Bekzod Rahmatov, Islom Egamberdiev +3
We study the static, spherically symmetric electric branch of spontaneously vectorized Einstein-vector-Gauss-Bonnet black holes close to its Schwarzschild bifurcation. A weakly non…
Blandford-Znajek Scaling in a Power-Law Rotating Kalb-Ramond Geometry: Magnetic-Flux Systematics and Bayesian Identifiability
Sardor Murodov, Olimjon Kholturayev, Bekzod Rahmatov +3
Relativistic jets from spinning black holes offer a possible strong-field probe of gravity through the Blandford-Znajek mechanism. We study the leading jet-power scaling in the fou…
Periodic orbits and gravitational wave signatures from magnetic dipoles around magnetized Kerr black holes
Shokhzod Jumaniyozov, Javlon Rayimbaev, Chengxun Yuan +3
We study periodic orbits and the associated gravitational radiation of a magnetized (uncharged) test particle carrying a magnetic dipole moment with coupling constant beta, moving…
Gravitational perturbations of a regular T-duality inspired black hole: Quasinormal modes, excitation factors, and time-domain evolution
Bekir Can Lütfüoğlu, Mardon Abdullaev, Javlon Rayimbaev +2
We study axial gravitational perturbations of the neutral regular black hole generated by a non-local, T-duality-inspired zero-point length and the associated gravitational self-en…
Circular-orbit dynamics and QPO constraints in static Einstein--scalar--Gauss--Bonnet black holes
Sardor Murodov, Bekzod Rahmatov, Otabek Umarov +3
Einstein--scalar--Gauss--Bonnet (EsGB) gravity provides a physically motivated framework for testing strong-field deviations from the Schwarzschild geometry through scalar hair. We…
Tidal Deformability of Neutron Stars in Bumblebee Gravity: Probing Lorentz Symmetry Breaking with Gravitational Waves
Ayan Banerjee, sherzod Sayfiyev, Muhtarama Radjapbaeva +3
We investigate the tidal properties of static neutron stars in the Neves--Gardim branch of bumblebee gravity, a vector--tensor theory in which a nonzero vacuum expectation value of…
Magnetically charged spinning particles around a regular black hole: constraints on the monopole charge from quasi-periodic oscillations
Shokhzod Jumaniyozov, Javlon Rayimbaev, Chengxun Yuan +4
We investigate the dynamics of magnetically charged spinning test particles in the spacetime of the Bardeen regular black hole, sourced by nonlinear electrodynamics and featuring a…
Particle dynamics and quasi-periodic oscillations of a Reissner--Nordström-like black hole in Kalb--Ramond gravity under an external magnetic test field
Faizuddin Ahmed, Ahmad Al-Badawi, Sardor Murodov +2
We investigate the dynamics of charged test particles and quasi-periodic oscillations around a Reissner--Nordström-like black hole in Kalb--Ramond (KR) gravity in the presence of a…
Corrected thermodynamics and radiation predictions of modified black bounce compact objects
Shokhzod Jumaniyozov, Javlon Rayimbaev, Yassine Sekhmani +3
We study the thermodynamic properties and radiation characteristics of a regular compact object obtained by applying the Simpson-Visser (SV) regularisation to the Schwarzschild mod…
Eikonal Ringing, Shadows, Lensing, Grey-Body Factors, and Binding Energy of Asymptotically Flat Regular Black Holes in Phantom Dirac-Born-Infeld Gravity
Mardon Abdullaev, Gumisbek Allambergenov, Diyorbek Rashidov +2
We develop a geodesic-optics description of eikonal quasinormal ringing, blackhole shadows, strong lensing, grey-body factors (GBFs), and the binding energy of massive particles fo…
Josephson Effects in Slowly Rotating Spacetimes
Nurmukhammed Aytimbetov, Reggie C. Pantig, Ali Övgün +2
We investigate Josephson phenomena in a slowly rotating stationary spacetime, emphasizing the distinct roles of gravitational redshift and rotational frame dragging motivated by [1…