Strong deflection gravitational lensing by an Einstein–Lovelock ultracompact object

We investigate the strong deflection gravitational lensing by an Einstein–Lovelock ultracompact object. Its unique features are the relativistic images inside its photon sphere which are absent for an Einstein–Lovelock black hole. We obtain its lensing observables and evaluate their observability fo...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2022-02, Vol.82 (2), p.1-17, Article 162
Main Authors: Gao, Yuan-Xing, Xie, Yi
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Black holes
Deflection
Elementary Particles
Elliptical galaxies
Gravitational lenses
Gravitational waves
Gravity
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Microlenses
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
Relativistic effects
Spacetime
Stars & galaxies
String Theory
Supermassive black holes
Theory of relativity
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Summary:We investigate the strong deflection gravitational lensing by an Einstein–Lovelock ultracompact object. Its unique features are the relativistic images inside its photon sphere which are absent for an Einstein–Lovelock black hole. We obtain its lensing observables and evaluate their observability for the direct images of two supermassive black holes in the Galaxy and M87 respectively, Sgr A* and M87*, and for the relativistic microlensing on a star closely around Sgr A*. We find that although it is impossible to tell difference of the ultracompact object from the black hole in Einstein–Lovelock gravity by the direct images, it might be possible to distinguish the Einstein–Lovelock ultracompact object by measuring the total flux of the relativistic microlensing in the not-so-far future.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-022-10128-z