DR. KINJALK LOCHAN

We will discuss a general formalism for characterization of an arbitrary non-vacuum inertial state in QFT, when described using (i) an arbitrary foliation and (ii) the response of Unruh DeWitt Detector (UDD) moving along an arbitrary trajectory. This formalism is used to explicitly compute the results for the Rindler frame and uniformly accelerated detectors. We will see that any arbitrary inertial state will always have a thermal component in the Rindler frame with additional contributions arising from the non-vacuum nature of the inertial state. We classify the nature of the additional contributions in terms of functions characterizing the inertial state. We establish that for all physically well behaved normalizable inertial states, the correction terms decay with the energy of the Rindler mode so that the high frequency limit is dominated by the thermal noise. A similar behavior arises in the response of the UDD as well. For arbitrary states, the two-point function lacks the symmetry of time translational invariance. We discuss several features of different definitions of transition rates for the detector in such cases. The implications for Black Hole evaporation will be discussed.