Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 24, Issue 7, Pages 1719-1731Publisher
IOP Publishing Ltd
DOI: 10.1088/0264-9381/24/7/003
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The transition probability in the first-order perturbation theory for an Unruh-DeWitt detector coupled to a massless scalar field in Minkowski space is calculated. It has been shown recently that the conventional i epsilon regularization prescription for the correlation function leads to non-Lorentz invariant results for the transition rate, and a different regularization, involving spatial smearing of the field, has been advocated to replace it. We show that the non-Lorentz invariance arises solely from the assumption of sudden switch-on and switch-off of the detector, and that when the model includes a smooth switching function the results from the conventional regularization are both finite and Lorentz invariant. The sharp switching limit of the model is also discussed, as well as the fall-off properties of the spectrum for large frequencies.
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