The GEMS Approach to Stationary Motions in the Spherically Symmetric   Spacetimes
  We generalize the work of Deser and Levin on the unified description of Hawking radiation and Unruh effect to general stationary motions in spherically symmetric black holes. We have also matched the chemical potential term of the thermal spectrum of the two sides for uncharged black holes. 
Hong-Zhi Chen, Yu Tian, Yi-Hong Gao, Xing-Chang Song