Alejandro Satz 2007 Class. Quantum Grav. 24 1719 doi:10.1088/0264-9381/24/7/003
Then again, how often does the Unruh–DeWitt detector click if we switch it carefully?
Alejandro Satz
Show affiliationsThe 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
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.
- PACS
- MSC
- Subjects
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Accelerators, beams and electromagnetism
- Dates
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Issue 7 (7 April 2007)
Received 29 November 2006, in final form 7 February 2007
Published 13 March 2007
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Then again, how often does the Unruh–DeWitt detector click if we switch it carefully?
Alejandro Satz 2007 Class. Quantum Grav. 24 1719
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