Academic Visits Abroad
Visited the University of Zululand, South Africa for research collaboration during Aug 27 - Nov 26, 1995.
Visited Yasouj University, Iran to give a course in Advanced Mathematical Physics to P. G. Physics Students and for research collaboration during April 21 - June 18, 2006.
Visited Mahani Mathematical Research Centre (Shahid Bahonar University of Kerman), Iran to give an invited talk on "Universe with time dependent cosmological constant and deceleration parameter" during June 5-6, 2006.
Visited Islamic Azad University of Estahban, Iran to give an invited talk on "Cosmological constant problem" during June 7-8, 2006.
External Member, Supervisory Committee, School of Graduate Studies, University of Putra (UPM), Malaysia during 2009 to 2011.
Visited the "Laboratory of Computational Sciences and Infromatics, Institute for Mathematical Research (INSPEM), University Putra Malaysia (UPM), Malaysia" as a visiting Scientist for one month (8 June - 8 July, 2010).
Visited JINR Laboratory of Information Technologies, Dubna, Moscow Region, Russia for a three months research stay from 1 September - 30 November, 2010.
Visited Kazan State University, Kazan, Russia for participating and delivering an invited talk in an International conference "Petrov 2010 Anniversary symposium on General Relativity & Gravitation" during November 1-6, 2010.
Visited the "Laboratory of Computational Sciences and Mathematical Physics, Institute for Mathematical Research (INSPEM), University Putra Malaysia (UPM), Malaysia" as a visiting Scientist for one month (18 July - 16 August, 2011).
Visited Perm State University, Perm, Russia for participating and delivering plenary talk in "Friedman Readings-International Scientific Conference" during June 24-28, 2013.
Invited to visit JINR Laboratory of Information Technologies, Dubna, Moscow Region, Russia for a four months research stay from June 2 - September 30, 2013.
Visited the Department of Mathematical Sciences, University of Zululand, South Africa as a Visiting Fellow from April 06-June 21, 2016
Visited the Department of Mathematical Sciences, University of Zululand, South Africa as a Visiting Research Fellow from November 01−December 09, 2017.
Visited the Department of Mathematical Sciences, University of Zululand, South Africa as a Visiting Research Fellow from April 20−June 14, 2018.
Visited the Department of Mathematical Sciences, University of Zululand, South Africa as a Visiting Research Fellow from December 15, 2022 − February 04, 2023).
Visited the Department of Mathematical Sciences, University of Zululand, South Africa as a Visiting Research Fellow from Aug 25 − Sep 30, 2023).
Invited to visit the Department of Mathematical Sciences, University of Zululand, South Africa as a Visiting Research Fellow from Jan 27 − Feb 27, 2026).
Academic Association with Indian Research Institutions
Visiting Associate, Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, from July 01, 2002 - June 30, 2008 and from August 01, 2010 - July 31, 2025. I have academic association with IUCAA since 1994.
Associate, Institute of Mathematical Sciences (IMSc.), Chennai (Madras) for the period from May 01, 2009 to April 30, 2012.
I had academic association with The Harish-Chandra Research Institute (HRI), Allahabad during 1999 - 2010.
I have academic association with Centre of Theoretical Physics, Jammia Millia Islamia, New Delhi since 2008.