Nonclassical nature of thermal quantum states in the oscillating FRW Universe Renu Dhayal, Meghna Rathore, Rahul Singhal, Anees Ahmed, Vijaya Kumar Kambila and K. K. Venkataratnam Eur. Phys. J. Plus, 136 4 (2021) 363 Published online: 07 April 2021 DOI: 10.1140/epjp/s13360-021-01213-5