On null geodesics and shadow of hairy black holes in Einstein-Maxwell-dilaton gravity

Abstract

The time-like and null-like geodesics around compact objects are some of the best tools to classify and understand the structure of a space-time. In this paper, we study the null geodesics around charged static dilaton black holes in Einstein-Maxwell-dilaton gravity. The physical parameters for non-radial geodesics including the effective potential, effective force, radius of the photon sphere and impact parameter are obtained and effects of the charge parameter and dilaton coupling constant on these quantities are studied. Possible photon motions for different values of the impact parameter are analyzed and unstable circular orbits and unbounded orbits are plotted. These results are compared to that of the Schwarzschild, Reissner-Nordstrom and Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) black holes. Also, we study the shadow cast by a dilaton black hole and investigate how the dilaton coupling affects the size of the black hole shadow. Finally, as an application of null geodesics, we calculate the deflection of light and investigate the effects of the model parameters on the bending angle.

19 pages, 13 figures, to appear in PRD

References in corpus (25)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• Null geodesics and shadow of a rotating black hole in extended Chern-Simons modified gravity
• Nonlinear electrodynamics effects on the black hole shadow, deflection angle, quasinormal modes and greybody factors
• Shadow of a Kaluza-Klein rotating dilaton black hole
• Shadows of Einstein-dilaton-Gauss-Bonnet black holes
• Geodesics of electrically and magnetically charged test particles in the Reissner-Nordström space-time: analytical solutions
• No-Hair Theorem in the Wake of Event Horizon Telescope
• Black hole merger estimates in Einstein-Maxwell and Einstein-Maxwell-dilaton gravity
• Geodesic Motion in Schwarzschild Spacetime Surrounded by Quintessence
• Test particle motion around black hole in Einstein-Maxwell-scalar theory
• Electrically charged black holes in linear and nonlinear electrodynamics: Geodesic analysis and scalar absorption
• Shadow and Photon Sphere of Black Hole in Clouds of Strings and Quintessence
• Geodesics and periodic orbits in Kehagias-Sfetsos black holes in deformed Hourava-Lifshitz gravity
• Accretion disks around the Gibbons-Maeda-Garfinkle-Horowitz-Strominger charged black holes
• Light paths of normal and phantom Einstein-Maxwell-dilaton black holes
• Geodesic motion around hairy black holes
• Thin accretion disks and charged rotating dilaton black holes
• Motion of Test Particles around a Charged Dilatonic Black Hole
• Null geodesics and shadow of 4$D$ Einstein-Gauss-Bonnet black holes surrounded by quintessence
• Geodesic of nonlinear electrodynamics and stable photon orbits
• Dynamical analysis of null geodesics in brane-world spacetimes
• Shadow of axisymmetric, stationary and asymptotically flat black holes in the presence of plasma
• Shadows of Lorentzian traversable wormholes

Cited by in corpus (24)

• Shadow and quasinormal modes of the Kerr-Newman-Kiselev-Letelier black hole
• Probing the Lorentz Symmetry Violation Using the First Image of Sagittarius A*: Constraints on Standard-Model Extension Coefficients
• Constraints on Barrow entropy from M87* and S2 star observations
• Absorption, scattering and shadow by a noncommutative black hole with global monopole
• Shadow of black hole surrounded by magnetized plasma: Axion-plasmon cloud
• Shadows of rotating Einstein-Maxwell-dilaton black holes surrounded by a plasma
• Shadows and weak gravitational lensing by the black hole in Einstein-Maxwell-scalar theory
• Shadows and photon rings of a spherically accreting Kehagias-Sfetsos black hole
• Dynamics of null particles and shadow for general rotating black hole
• Influence of plasma on the optical appearance of spinning black hole in Kalb-Ramond gravity and its Existence around M87* and Sgr A*
• Circular geodesics in the field of double-charged dilatonic black holes
• Effect of quintessence dark energy on the shadow of Hayward black holes with spherical accretion
• Galactic black hole immersed in a dark halo with its surrounding thin accretion disk
• Remarks on the light ring images and the optical appearance of hairy black holes in Einstein-Maxwell-dilaton gravity
• On optical appearance of Einstein-Maxwell-Æther black holes surrounded by various accretions
• Trajectories of photons around a rotating black hole with unusual asymptotics
• Modelling the Sgr A${}^{\ast }$ and M87${}^{\ast }$ shadows by using the Kerr-Taub-NUT metrics in the presence of a scalar field
• Massive particle surfaces, partial umbilicity and circular orbits
• Scattering and absorption by extra-dimensional black holes with GUP
• Neutral particle collisions near Gibbons-Maeda-Garfinkle-Horowitz-Strominger black holes after shadow observations
• Lyapunov exponents and geodesic stability of Schwarzschild black hole in the non-commutative gauge theory of gravity
• Shadows cast by a class of rotating black bounces with an anisotropic fluid
• Geodesic dynamics in brane-de Sitter wormholes
• Exact Dynamical Black Hole Solutions in Five or Higher Dimensions