کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10725749 | 1034191 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Response of Unruh-DeWitt detector with time-dependent acceleration
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Response of Unruh-DeWitt detector with time-dependent acceleration Response of Unruh-DeWitt detector with time-dependent acceleration](/preview/png/10725749.png)
چکیده انگلیسی
It is well known that a detector, coupled linearly to a quantum field and accelerating through the inertial vacuum with a constant acceleration g, will behave as though it is immersed in a radiation field with temperature T=(g/2Ï). We study a generalization of this result for detectors moving with a time-dependent acceleration g(Ï) along a given direction. After defining the rate of excitation of the detector appropriately, we evaluate this rate for time-dependent acceleration, g(Ï), to linear order in the parameter η=gË/g2. In this case, we have three length scales in the problem: gâ1, (gË/g)â1 and Ïâ1 where Ï is the energy difference between the two levels of the detector at which the spectrum is probed. We show that: (a) When Ïâ1âªgâ1âª(gË/g)â1, the rate of transition of the detector corresponds to a slowly varying temperature T(Ï)=g(Ï)/2Ï, as one would have expected. (b) However, when gâ1âªÏâ1âª(gË/g)â1, we find that the spectrum is modified even at the orderO(η). This is counter-intuitive because, in this case, the relevant frequency does not probe the rate of change of the acceleration since (gË/g)âªÏ and we certainly do not have deviation from the thermal spectrum when gË=0. This result shows that there is a subtle discontinuity in the behavior of detectors with gË=0 and gË/g2 being arbitrarily small. We corroborate this result by evaluating the detector response for a particular trajectory which admits an analytic expression for the poles of the Wightman function.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 690, Issue 2, 14 June 2010, Pages 201-206
Journal: Physics Letters B - Volume 690, Issue 2, 14 June 2010, Pages 201-206
نویسندگان
Dawood Kothawala, T. Padmanabhan,