Unruh-DeWitt detector in the presence of multiple scalar fields: A toy model Chandramouli Chowdhury, Ashmita Das and Bibhas Ranjan Majhi Eur. Phys. J. Plus, 134 2 (2019) 65 Published online: 15 February 2019 DOI: 10.1140/epjp/i2019-12400-2