https://doi.org/10.1140/epjc/s10052-020-8021-8
Regular Article - Theoretical Physics
Strong deflection gravitational lensing by a Lee-Wick ultracompact object
1
School of Astronomy and Space Science, Nanjing University, Nanjing, 210023, China
2
Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education, Nanjing, 210023, China
* e-mail: yixie@nju.edu.cn
Received:
1
March
2020
Accepted:
6
May
2020
Published online:
19
May
2020
We study strong deflection gravitational lensing by a Lee-Wick ultracompact object. Its unique feature is a series of relativistic images inside its photon sphere, which are absent in the case of a black hole. We obtain its observables and estimate them for the supermassive black holes Sgr A* and M87* respectively in the Galactic center and in the center of M87. We find that the innermost relativistic image is a very promising signature according to its angular separation from the photon sphere and its considerable brightness. A preliminary bound on the UV scale of such an object is estimated based on the shadow of M87*.
© The Author(s), 2020
