On the cancellation mechanism of radiation from the Unruh detector

Satoshi Iso, Kazuhiro Yamamoto, Sen Zhang

研究成果: ジャーナルへの寄稿学術誌査読

6 被引用数 (Scopus)


A uniformly accelerated detector (Unruh detector) in a Minkowski vacuum is excited as if it is exposed to a thermal bath with a temperature proportional to its acceleration. In the inertial frame, since both the excitation and de-excitation of the detector are accompanied by emission of radiation into the Minkowski vacuum, one may suspect that the Unruh detector emits radiation like Larmor radiation from an accelerated charged particle. However, it is known that the radiation is miraculously canceled out by a quantum interference effect. In this paper, we investigate the conditions under which the radiation cancels out.We first show that the cancellation occurs if the Green function satisfies a relation similar to the Kubo-Martin-Schwinger (KMS) condition. We then study two examples, Unruh detectors in 3+1-dimensional Minkowski spacetime and in de Sitter spacetime. In both cases, the relation holds only in a restricted region of the spacetime, but the radiation is canceled over the whole spacetime. Hence the KMS-like relation is necessary but not sufficient for the cancellation to occur.

ジャーナルProgress of Theoretical and Experimental Physics
出版ステータス出版済み - 6月 2013

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)


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