On the spectral shift and the time delay of light in a Rindler   accelerated frame
  We discuss two effects predicted by the general theory of relativity in the context of Rindler accelerated observers: the gravitational spectral shift and the time delay of light. We show that these effects also appear in a Rindler frame in the absence of gravitational field, in accordance with the Einstein's equivalence principle. 
J. B. Formiga and C. Romero