Then again, how often does the Unruh-DeWitt detector click if we switch it carefully?

Details Then again, how often does the Unruh-DeWitt detector click if we switch it carefully? Then again, how often does the Unruh-DeWitt detector click if we switch it carefully?

2006-11-13

arxiv.org/abs/gr-qc/0611067v3

Class.Quant.Grav.24:1719-1732,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages, v3. Final published version with section 5 expanded

Scientific paper

10.1088/0264-9381/24/7/003

The transition probability in 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 $i\epsilon$ regularisation prescription for the correlation function leads to non-Lorentz invariant results for the transition rate, and a different regularisation, 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 regularisation are both finite and Lorentz invariant. The sharp switching limit of the model is also discussed, as well as the falloff properties of the spectrum for large frequencies.

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