https://doi.org/10.1140/epjp/s13360-022-02454-8
Regular Article
Strong gravitational lensing around Kehagias–Sfetsos compact objects surrounded by plasma
1
Research Centre for Theoretical Physics and Astrophysics, Institute of Physics in Opava, Silesian University in Opava, Bezruc̃ovo náměsti 13, 74601, Opava, Czech Republic
2
Ulugh Beg Astronomical Institute, Astronomy St. 33, 100052, Tashkent, Uzbekistan
3
Shanghai Astronomical Observatory, 80 Nandan Road, 200030, Shanghai, People’s Republic of China
4
Institute of Nuclear Physics, Ulugbek 1, 100214, Tashkent, Uzbekistan
5
National University of Uzbekistan, 100174, Tashkent, Uzbekistan
6
Institute of Fundamental and Applied Research of National Research University TIIAME, Kori Niyoziy, 39, 100000, Tashkent, Uzbekistan
Received:
27
October
2021
Accepted:
6
February
2022
Published online:
18
February
2022
We present the analysis how Hořava gravity and plasma influence the strong lensing phenomena around Kehagias–Sfetsos (KS) black holes. Using the semi-analytical Bozza method of strong lensing limit, we determine the multiple images, namely their separation S, and magnification R. We apply our calculations to the case of supermassive black hole having mass 
and being at distance 
from observer corresponding to those observed in M87. We show that the sensitivity of image magnification, image separation, and shadow angular size on KS parameter 
and plasma parameter k are of order from 1 to 
for R and 
for S.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022
