Dr. Kaushik Bhattacharya obtained his doctoral degree at the Saha Institute of Nuclear Physics, Kolkata. Subsequently he carried out postdoctoral research in Physical Research Laboratory (PRL), Ahmedabad and Instituto de Ciencias Nucleares (ICN) in the National Autononomous University of Mexico (UNAM) in Mexico City. He is a theoretical physicist, whose chief interest lies in cosmology and quantum field theory in curved spacetime. His interests also lie in problems related with astro-particle physics and modified theories of gravity. Dr. Soumik Mukhopadhyay received his doctoral degree from Saha Institute of Nuclear Physics, Kolkata. Later on, he was in the Department of Physics, Indian Institute of Science, Bangalore as a Centenary Postdoctoral Fellow. He is an experimental physicist with research interests in the area of magnetism and strongly correlated electron systems.?