384 citations · 1.1k across the 28 of their papers we have counts for
23 papers · 1 filter
Constraints on Kalb-Ramond Gravity from EHT Observations of Rotating Black Holes in Traceless Conformal Electrodynamics
Yassine Sekhmani, Kuantay Boshkayev, Mustapha Azreg-Aïnou +3
We present a phenomenological study of rotating, charged black holes in Einstein gravity coupled to a traceless (conformal) matter sector formed by ModMax nonlinear electrodynamics…
Rotating cosmological cylindrical wormholes in GR and TEGR sourced by anisotropic fluids
Mustapha Azreg-Aïnou
Given an anisotropic fluid source, we determine in closed forms, upon solving the field equations of general relativity (GR) and teleparallel gravity (TEGR) coupled to a cosmologic…
Orbital mechanics and quasiperiodic oscillation resonances of black holes in Einstein-Æther theory
Mustapha Azreg-Aïnou, Zihang Chen, Bojun Deng +4
In this paper, we study the motion of test particles around two exact charged black-hole solutions in Einstein-Æther theory. Specifically, we first consider the quasi-periodic osci…
Cylindrically symmetric static -dimensional (un)charged (anti-)de Sitter black holes in generic gravity
Mustapha Azreg-Aïnou
Given a generic function we construct in closed forms cylindrically symmetric static -dimensional uncharged and charged de Sitter and anti-de Sitter solutions (including…
Rotating normal and phantom Einstein--Maxwell--dilaton black holes: Geodesic analysis
Mustapha Azreg-Aïnou, Sumarna Haroon, Mubasher Jamil +1
Depending on five parameters, rotating counterparts of Einstein--Maxwell--dilaton black holes are derived. We discuss their physical and geometric properties and investigate their…
Accretion of rotating fluids onto stationary solutions
Mustapha Azreg-Aïnou
We consider a general stationary solution and derive the general laws for accretion of rotating perfect fluids. For non-degenerate and degenerate Fermi and Bose fluids we derive ne…
Cyclic and heteroclinic flows near general static spherically symmetric black holes: Semi-cyclic flows -- Addendum and corrigendum
Mustapha Azreg-Aïnou
We present new accretion solutions of a polytropic perfect fluid onto an f(R)-gravity de Sitter-like black hole. We consider two f(R)-gravity models and obtain finite-period cyclic…
Vacuum and nonvacuum black holes in a uniform magnetic field
Mustapha Azreg-Aïnou
We modify and generalize the known solution for the electromagnetic field when a vacuum, stationary, axisymmetric black hole is immersed in a uniform magnetic field to the case of…
Wormhole solutions sourced by fluids, II: Three-fluid two-charged sources
Mustapha Azreg-Aïnou
Lack of a consistent metric for generating rotating wormholes motivates us to present a new one endowed with interesting physical and geometrical properties. When combined with the…
Wormhole solutions sourced by fluids, I: Two-fluid charged sources
Mustapha Azreg-Aïnou
We briefly discuss some of the known and new properties of rotating geometries that are relevant to this work. We generalize the analytical method of superposition of fields, known…
Confined-exotic-matter wormholes with no gluing effects -- Imaging supermassive wormholes and black holes
Mustapha Azreg-Aïnou
We classify wormholes endowed with redshift effects and finite mass into three types. Type I wormholes have their radial pressure dying out faster, as one moves away from the throa…
Charged de Sitter-like black holes: quintessence-dependent enthalpy and new extreme solutions
Mustapha Azreg-Aïnou
We consider Reissner-Nordström black holes surrounded by quintessence where both a non-extremal event horizon and a cosmological horizon exist besides an inner horizon ($-1\leq ω<-…
Generating rotating regular black hole solutions without complexification
Mustapha Azreg-Aïnou
We drop the complexification procedure from the Newman-Janis algorithm and introduce more physical arguments and symmetry properties, and we show how one can generate regular and s…
Regular and conformal regular cores for static and rotating solutions
Mustapha Azreg-Aïnou
Using a new metric for generating rotating solutions, we derive in a general fashion the solution of an imperfect fluid and that of its conformal homolog. We discuss the conditions…
From static to rotating to conformal static solutions: Rotating imperfect fluid wormholes with(out) electric or magnetic field
Mustapha Azreg-Aïnou
We derive a shortcut stationary metric formula for generating imperfect fluid rotating solutions, in Boyer-Lindquist coordinates, from spherically symmetric static ones. We explore…
Phase-space analysis of the cosmological 3-fluid problem: Families of attractors and repellers
Mustapha Azreg-Aïnou
We perform a phase-space analysis of the cosmological 3-fluid problem consisting of a barotropic fluid with an equation-of-state parameter , a pressureless dark matter fluid,…
Numerical solutions to the cosmological 3-fluid problem
Mustapha Azreg-Aïnou
We show that, for the scalar field cosmology with exponential potential, the set of values of the coupling parameter for which the solutions undergo a transient period of accelerat…
Light paths of normal and phantom Einstein-Maxwell-dilaton black holes
Mustapha Azreg-Aïnou
Null geodesics of normal and phantom Einstein-Maxwell-dilaton black holes are determined analytically by the Weierstrass elliptic functions. The black hole parameters other than th…
Developed Adomian method for quadratic Kaluza-Klein relativity
Mustapha Azreg-Aïnou
We develop and modify the Adomian decomposition method (ADecM) to work for a new type of nonlinear matrix differential equations (MDE's) which arise in general relativity (GR) and…
Selection criteria for two-parameter solutions to scalar-tensor gravity
Mustapha Azreg-Aïnou
We make a systematic investigation of the generic properties of static, spherically symmetric, asymptotically flat solutions to the field equations describing gravity minimally cou…
Quadratic superconducting cosmic strings revisited
Mustapha Azreg-Aïnou
It has been shown that 5-dimensional general relativity action extended by appropriate quadratic terms admits a singular superconducting cosmic string solution. We search for cosmi…
Regularity and stability of electrostatic solutions in Kaluza-Klein theory
M. Azreg-Ainou, G. Clement, C. P. Constantinidis +1
We investigate the family of electrostatic spherically symmetric solutions of the five-dimensional Kaluza-Klein theory. Besides black holes and wormholes, a new class of geodesical…
Instability of two-dimensional heterotic stringy black holes
Mustapha Azreg-Ainou
We solve the eigenvalue problem of general relativity for the case of charged black holes in two-dimensional heterotic string theory, derived by McGuigan et al. For the case of $m^…