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Using nonperturbative results obtained recently for an uniformly acceleratedUnruh-DeWitt detector, we discover new features in the dynamical evolution ofthe detector's internal degree of freedom, and identified the Unruh effectderived originally from time-dependent perturbation theory as operative in theultra-weak coupling and ultra-high acceleration limits. The mutual interactionbetween the detector and the field engenders entanglement between them, andtracing out the field leads to a mixed state of the detector even for adetector at rest in Minkowski vacuum. Our findings based on this exact solutionshows clearly the differences from the ordinary result where the quantumfield's backreaction is ignored in that the detector no longer behaves like aperfect thermometer. From a calculation of the evolution of the reduced densitymatrix of the detector, we find that the transition probability from theinitial ground state over an infinitely long duration of interaction derivedfrom time-dependent perturbation theory is existent in the exact solution onlyin transient under special limiting conditions corresponding to the Markovianregime. Furthermore, the detector at late times never sees an exact Boltzmanndistribution over the energy eigenstates of the free detector, thus in thenon-Markovian regime covering a wider range of parameters the Unruh temperaturecannot be identified inside the detector.Comment: 12 pages, 2 figures, no alteration of the main findings and claims  but includes at the prompting of the referees discussion

Backreaction and the Unruh effect: New insights from exact solutions of uniformly accelerated detectors