Eur. Phys. J. Plus (2019) 134: 65
https://doi.org/10.1140/epjp/i2019-12400-2

Regular Article

Unruh-DeWitt detector in the presence of multiple scalar fields: A toy model

¹ Department of Physics, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
² International Centre for Theoretical Sciences, Bengaluru, 560089, North Karnataka, India

^* e-mail: bibhas.majhi@iitg.ac.in

Received: 16 October 2018
Accepted: 15 November 2018
Published online: 15 February 2019

Abstract

Applications of Unruh-Fulling (UF) effect are well studied in the literature via the interaction of the Unruh-DeWitt (UD) detector and single scalar field. In this work, we investigate a toy model, where the detector is interacting simultaneously with the multiple scalar fields. Our study reveals that the transition rate of the system significantly depends on the acceleration of the detector and the number of scalar fields (n). For , there exists a critical acceleration, beyond which the transition rate becomes drastically higher than the accelerations below the critical point. The appearance of such critical point never occurs in case of the interaction of the UD detector and single scalar field.