Time-dependent scalar fields in modified gravities in a stationary spacetime Yi Zhong, Bao-Ming Gu, Shao-Wen Wei and Yu-Xiao Liu Eur. Phys. J. C, 76 7 (2016) 377 Published online: 06 July 2016 DOI: 10.1140/epjc/s10052-016-4225-3