Gravitational lensing around Kehagias–Sfetsos compact objects surrounded by plasma

Sudipta Hensh (Institute of Physics and Research Centre of Theoretical Physics and Astrophysics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo náměstí 13, Opava, 74601, Czech Republic) ; Ahmadjon Abdujabbarov (Center for Field Theory and Particle Physics and Department of Physics, Fudan University, Shanghai, 200438, China; Ulugh Beg Astronomical Institute, Astronomicheskaya 33, Tashkent, 100052, Uzbekistan) ; Jan Schee (Institute of Physics and Research Centre of Theoretical Physics and Astrophysics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo náměstí 13, Opava, 74601, Czech Republic) ; Zdeněk Stuchlík (Institute of Physics and Research Centre of Theoretical Physics and Astrophysics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo náměstí 13, Opava, 74601, Czech Republic)

We study the optical properties of the Kehagias–Sfetsos (KS) compact objects, characterized by the “Hořava” parameter $$\omega _{_{KS}}$$ ωKS , in the presence of plasma, considering its homogeneous or power-law density distribution. The strong effects of both “Hořava” parameter $$\omega _{_{KS}}$$ ωKS and plasma on the shadow cast by the KS compact objects are demonstrated. Using the weak field approximation, we investigate the gravitational lensing effect. Strong dependence of the deflection angle of the light on both the “Hořava” and plasma parameter is explicitly shown. The magnification of image source due to the weak gravitational lensing is given for both the homogeneous and inhomogeneous plasma.

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      "surname": "Abdujabbarov", 
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      "surname": "Stuchl\u00edk", 
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      "source": "Springer", 
      "value": "We study the optical properties of the Kehagias\u2013Sfetsos (KS) compact objects, characterized by the \u201cHo\u0159ava\u201d parameter $$\\omega _{_{KS}}$$ <math><msub><mi>\u03c9</mi><msub><mrow></mrow><mrow><mi>KS</mi></mrow></msub></msub></math> , in the presence of plasma, considering its homogeneous or power-law density distribution. The strong effects of both \u201cHo\u0159ava\u201d parameter $$\\omega _{_{KS}}$$ <math><msub><mi>\u03c9</mi><msub><mrow></mrow><mrow><mi>KS</mi></mrow></msub></msub></math>  and plasma on the shadow cast by the KS compact objects are demonstrated. Using the weak field approximation, we investigate the gravitational lensing effect. Strong dependence of the deflection angle of the light on both the \u201cHo\u0159ava\u201d and plasma parameter is explicitly shown. The magnification of image source due to the weak gravitational lensing is given for both the homogeneous and inhomogeneous plasma."
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Published on:
09 July 2019
Publisher:
Springer
Published in:
European Physical Journal C , Volume 79 (2019)
Issue 6
Pages 1-14
DOI:
https://doi.org/10.1140/epjc/s10052-019-7034-7
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

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