Fluctuation-dissipation theorem and the Unruh effect of scalar and Dirac fields - art. no. 084001.

We present a simple and systematic method to calculate Rindler noise, which is relevant to an analysis of the Unruh effect, by using the fluctuation-d issipation theorem. To do this, we calculate the dissipative coefficient ex plicitly from the equations of motion of the: detector and the field. This method gives not only the correct answer but also a hint as to the origin o f the apparent statistics inversion effect. Moreover, this method is genera lized to the Dirac field by using the fermionic fluctuation-dissipation the orem. We can thus confirm that the fermionic fluctuation-dissipation theore m is working properly. [S0556-2821(99)00518-4].