1. Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi, 110025, India
2. Inter-University Center for Astronomy and Astrophysics, Post Bag 4, Pune 411 007, India
3. Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa