Observational signature of a near-extremal Kerr-Sen black hole in the heterotic string theory

Abstract

We analytically study the optical appearance of an isotropically emitter orbiting near the horizon of a near-extremely rotating Kerr-Sen (KS) black hole which is an electrically charged black hole arising in heterotic string theory. We study the influence of the Sen charge on the observational quantities, including the image position, flux and redshift factor. Moreover, we compare the results with those for a near-extremal Kerr-Newman (KN) black hole, which is the charged rotating black hole in general relativity. We find quantitative corrections of the signatures of these charged black holes (both KS and KN) compare to that of a neutral Kerr black hole. This may serve as distinctive features of different black holes for future tests by the Event Horizon Telescope.

12 pages, 1 figure and 1 table. Reference added, published in PRD

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Cited by in corpus (20)

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• Photon Ring and Observational Appearance of a Hairy Black Hole
• Influence of Quantum Correction on the Black Hole Shadows, Photon Rings and Lensing Rings
• QED Effect on Black Hole Shadow
• Revisiting the shadow of braneworld black holes
• Can the dynamics of test particles around charged stringy black holes mimic the spin of Kerr black holes?
• Thermal Image and Phase Transitions of Charged AdS Black Holes using Shadow Analysis
• Optical appearance of Einstein-Æther black hole surrounded by thin disk
• Light rings and long-lived modes in quasi-black hole spacetimes
• Signatures of Einstein-Maxwell dilaton-axion gravity from the observed jet power and the radiative efficiency
• Geodesic structure, shadow and optical appearance of black hole immersed in Chaplygin-like dark fluid
• Polarized Images of Synchrotron Radiations in Curved Spacetime
• Observational Appearance of a Freely-falling Star in an Asymmetric Thin-shell Wormhole
• Photon Emission Near Myers-Perry Black Holes in the Large Dimension Limit
• Photon emissions from near-horizon extremal and near-extremal Kerr equatorial emitters
• High spin expansion for null geodesics
• Observability of Zero-angular-momentum Sources Near Kerr Black Holes
• Higher-derivative Heterotic Kerr-Sen Black Holes
• Consistent Four-derivative Heterotic Truncations and the Kerr-Sen Solution
• QED Effects on Kerr Black Hole Shadows immersed in uniform magnetic fields