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Research PapersNo Access

Deflection of light and shadow cast by a dual-charged stringy black hole

Department of Physics, Gurukula Kangri Vishwavidyalaya, Haridwar 249 404, Uttarakhand, India

E-mail Address: shubhamkala871@gmail.com

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Department of Physics, Dyal Singh College, University of Delhi, New Delhi 110003, India

E-mail Address: sbhkmr1999@gmail.com

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,

http://orcid.org/0000-0003-3300-0253

Department of Physics, Gurukula Kangri Vishwavidyalaya, Haridwar 249 404, Uttarakhand, India

Center for Space Research, North-West University, Mahikeng 2745, South Africa

E-mail Address: hnandan@associates.iucaa.in

Corresponding author.

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Department of Physics, Gurukula Kangri Vishwavidyalaya, Haridwar 249 404, Uttarakhand, India

E-mail Address: prteeksh@gmail.com

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https://doi.org/10.1142/S0217751X20501778Cited by:14 (Source: Crossref)

Abstract

Gravitational lensing and black hole shadows are one of the strongest observational evidences to prove the existence of black holes in the universe. The gravitational lensing arises due to the deflection of light by the gravitational field of a gravitating body such as a black hole. Investigation of the shadow cast by a compact object as well as deflection of light around it may provide the useful information about physical nature of the particular compact object and other related aspects. In this paper, we study the deflection of light by a dual-charged stringy black hole space–time derived in dilaton-Maxwell gravity. The variation of deflection angle with the impact parameter for different values of electric and magnetic charges is studied. We also study the shadow of this black hole space–time to obtain the radius of shadow cast by it. We have considered an optically thin emission disk around it and observed that there are not significant changes in the shadow cast by this black hole compared to well-known Schwarzschild black hole space–time in GR.

Keywords:

PACS: 04.50.+h, 97.60.Lf, 04.70.-s

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Journal cover image

Vol. 35, No. 28

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History

Received 28 July 2020

Revised 15 September 2020

Accepted 18 September 2020

Published: 9 October 2020

Keywords