107 citations · 273 across the 20 of their papers we have counts for
24 papers
Orbital stability, relativistic precession, and QPO constraints for constant-curvature black holes in gravity
Kourosh Nozari, Sara Saghafi, Khadijeh Salahshour +1
We analyze circular-orbit stability, epicyclic resonances, relativistic precession, and quasi-periodic-oscillation (QPO) constraints in the constant-curvature vacuum sector of metr…
Effective reheating in Gauss--Bonnet inflation with coupling
Ali Seidabadi, Sara Saghafi, Kourosh Nozari
We study effective reheating in a scalar--Gauss--Bonnet inflationary model with a phase-space-dependent coupling , in which a compact field-space feature is combined with a…
Probing Quantum Gravity through Chaotic Orbits and Strong-Field Effects in Kerr Black Holes Embedded in Perfect Fluid Dark Matter
Shubham Kala, Sara Saghafi, M. Yousaf +4
We study the nonlinear photon dynamics in quantum improved rotating black hole surrounded by perfect fluid dark matter (PFDM) using several methods of analysis, including Poincaré…
Higher Dimensional Loop Quantum Black hole in de Sitter Spacetime: Quasinormal Modes and Shadow Signatures
Sara Saghafi, Kourosh Nozari, Ali Mohammadpour
We investigate the dynamical and optical properties of a higher-dimensional loop-quantum-corrected black hole in a de Sitter background. We first analyze the horizon structure and…
Thin Accretion Disks around Rotating Charged Black Holes in an Effective Higher-Curvature Spacetime
Mohammad Hassani, Kourosh Nozari, Sara Saghafi
We investigate the structure and emission properties of a thin accretion disk around a rotating charged black hole described by an effective higher-curvature-inspired spacetime, co…
Beyond : Gauss--Bonnet inflation with
Ali Seidabadi, Sara Saghafi, Kourosh Nozari
Gauss--Bonnet inflation typically affects the dynamics over an extended portion of the trajectory, making it difficult to isolate a controlled imprint at CMB scales. We consider a…
Phenomenological Rotating Extension of Black Holes with Primary Scalar Hair: Shadow Signatures in Beyond Horndeski Gravity
Kourosh Nozari, Milad Hajebrahimi, Sara Saghafi +2
The Event Horizon Telescope (EHT) image of M87* provides a direct test of strong-field gravity, measuring an angular shadow diameter and a circularity…
Accretion Process as a Probe of Extra Dimensions in MOG Compact Object Spacetimes
Kourosh Nozari, Sara Saghafi, Zeynab Ramezanpasandi
The idea of extra spatial dimensions arises from attempts to unify gravity with other fundamental interactions, develop a consistent theory of quantum gravity, and address open pro…
Shadow of Extreme Compact Charged Objects in Consistent 4-Dimensional Einstein-Gauss-Bonnet Gravity
Sara Saghafi, Kourosh Nozari, Maryam Kaveh
In order to better describe gravitational phenomena on both very small and cosmological scales, there have been constant attempts to generalize and expand the theory of General Rel…
Investigating QED Effects on the Thin Accretion Disk Properties Around Rotating Euler-Heisenberg Black Holes
Kourosh Nozari, Sara Saghafi, Fatemeh Aliyan
The Einstein Euler Heisenberg (EEH) black hole model represents an extension of classical black hole solutions in general relativity by incorporating quantum electrodynamic (QED) c…
Circular orbits and accretion disk around a deformed-Schwarzschild black hole in loop quantum gravity
Kourosh Nozari, Sara Saghafi, Milad Hajebrahimi +1
In this paper, we study the motion of neutral and electrically charged particles in the vicinity of a deformed-Schwarzschild black hole inspired by Loop Quantum Gravity (LQG). To e…
Optical Signatures of Einstein-Euler-Heisenberg AdS/dS Black Holes in the light of Event Horizon Telescope
Khadije Jafarzade, Zeynab Bazyar, Sara Saghafi +1
Recent observations of the supermassive black holes and Sgr A by the Event Horizon Telescope (EHT) have sparked intensified interest in studying the optical appea…
Black holes surrounded by massive vector fields in Kaluza-Klein gravity
Kimet Jusufi, Ankit Anand, Sara Saghafi +2
We present an exact black hole solution surrounded by massive vector fields predicted by Kaluza-Klein (KK) gravity. KK gravity in four dimensions (4D) is of particular interest, as…
Accretion onto a Charged Black Hole in Consistent 4D Einstein-Gauss-Bonnet Gravity
Kourosh Nozari, Sara Saghafi, Mohammad Hassani
In astrophysics, accretion is the process by which a massive object acquires matter. The infall leads to the extraction of gravitational energy. Accretion onto dark compact objects…
Higher-Dimensional MOG dark compact object: shadow behavior in the light of EHT observations
Kourosh Nozari, Sara Saghafi, Ali Mohammadpour
Consideration of extra spatial dimensions is motivated by the unification of gravity with other interactions, the achievement of the ultimate framework of quantum gravity, and fund…
Extended Uncertainty Principle: A Deeper Insight into the Hubble Tension?
Kourosh Nozari, Sara Saghafi, Milad Hajebrahimi
The standard cosmological model, known as the LambdaCDM model, has been successful in many respects, but it has some significant discrepancies, some of which have not been resolved…
Asymptotically locally flat and AdS higher-dimensional black holes of Einstein-Horndeski-Maxwell gravity in the light of EHT observations: shadow behavior and deflection angle
Kourosh Nozari, Sara Saghafi
Unification of gravity with other interactions, achieving the ultimate framework of quantum gravity, and fundamental problems in particle physics and cosmology motivate to consider…
Shadow Behavior of the Quantum-Corrected Schwarzschild Black Hole Immersed in Holographic Quintessence
Sara Saghafi, Kourosh Nozari
In this paper, we aim to explore the impact of the Planck scale corrections and the Holographic quintessence on the shadow behavior of non-rotating black holes. To do this, we cons…
Accretion onto a static spherically symmetric regular MOG dark compact object
Kourosh Nozari, Sara Saghafi, Fateme Aliyan
In astrophysics, the process of a massive body acquiring matter is referred to as accretion. The extraction of gravitational energy occurs as a result of the infall. Since it conve…
Hawking-Like Radiation as Tunneling from a Cosmological Black Hole in Modified Gravity: Semiclassical Approximation and Beyond
Sara Saghafi, Kourosh Nozari
Hawking radiation as a quantum phenomenon is generally attributed to the existence of the event horizon of a black hole. However, we demonstrate in this paper that there is indeed…
Quantum Corrections to the Accretion onto a Schwarzschild Black Hole in the Background of Quintessence
Kourosh Nozari, Milad Hajebrahimi, Sara Saghafi
It is well known that quantum effects may lead to remove the intrinsic singularity point of back holes. Also, the quintessence scalar field is a candidate model for describing late…
Thermodynamics of Non-Commutative Scalar-Tensor-Vector Gravity Black holes
Sara Saghafi, Koroush Nozari, Milad Hajebrahimi
In this paper, we analyze the thermodynamic stability of Schwarzschild Modified Gravity (MOG) black holes in a non-commutative framework. We show that, unlike a commutative MOG bla…
Black hole thermodynamics in Snyder phase space
Sara Saghafi, Kourosh Nozari
By defining a noncommutative symplectic structure, we study thermodynamics of Schwarzschild black hole in a Snyder noncommutative phase space for the first time. Since natural cuto…
Natural Cutoffs and Quantum Tunneling from Black Hole Horizon
Kourosh Nozari, S. Saghafi
We study tunneling of massless particles through quantum horizon of a Schwarzschild black hole where quantum gravity effects are taken into account. These effects are encoded in th…