Stochastic Analysis of an Accelerated Charged Particle -Transverse Fluctuations-
Stochastic Analysis of an Accelerated Charged Particle -Transverse Fluctuations-
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DOI：
10.1103/physrevd.84.025005
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发表时间：
2010-11
影响因子：
5
通讯作者：
S. Iso;Yasuhiro Yamamoto;Sen Zhang
中科院分区：
文献类型：
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作者：
S. Iso;Yasuhiro Yamamoto;Sen Zhang
加速粒子将闵可夫斯基真空视为热激发的，并且粒子由于与热浴的相互作用而随机移动。这种相互作用使粒子的横向动量波动，就像热浴中的布朗运动一样。由于这种脉动运动，人们讨论了除了经典的拉莫尔辐射之外，加速的带电粒子还会发射额外的辐射（Unruh 辐射 [P. Chen 和 T. Tajima, Phys. Rev. Lett. 83, 256 (1999).]），并且正在计划通过使用在不久的将来构建的超高强度激光器来检测此类辐射的实验 [P. Chen 和 T. Tajima, Phys. Rev. Lett. 83, 256 (1999).]）。 G. Thirolf、D. Habs、A. Henig、D. Jung、D. Kiefer、C. Lang、J. Schreiber1、C. Maia、G. Schaller、R. Schutzhold 和 T. Tajima，Eur。物理。 J. D 55, 379 (2009).][http://www.extreme-light-infrastruct.eu/.]。然而，也有人反驳说，真空波动和脉动运动之间的干涉效应会抵消辐射。事实上，在可以精确求解海森堡运动方程的内部探测器的情况下，热化完成后不存在额外的辐射[D. J. Raine、D. W. Sciama 和 P. G. Grove，Proc。 R.苏克。伦敦。 A 435, 205 (1991).][A. Raval、B. L. Hu 和 J. Anglin，物理学家。修订版 D 53, 7003 (1996).]。在本文中，我们重新讨论了 QED 标量场模拟中加速带电粒子的问题。我们通过研究粒子的随机运动证明了横向动量均分定理，并表明安鲁辐射被干涉效应部分抵消。
An accelerated particle sees the Minkowski vacuum as thermally excited, and the particle moves stochastically due to an interaction with the thermal bath. This interaction fluctuates the particle's transverse momenta like the Brownian motion in a heat bath. Because of this fluctuating motion, it has been discussed that the accelerated charged particle emits extra radiation (the Unruh radiation [P. Chen and T. Tajima, Phys. Rev. Lett. 83, 256 (1999).]) in addition to the classical Larmor radiation, and experiments are under planning to detect such radiation by using ultrahigh intensity lasers constructed in near future [P. G. Thirolf, D. Habs, A. Henig, D. Jung, D. Kiefer, C. Lang, J. Schreiber1, C. Maia, G. Schaller, R. Schutzhold, and T. Tajima, Eur. Phys. J. D 55, 379 (2009).][http://www.extreme-light-infrastructure.eu/.]. There are, however, counterarguments that the radiation is canceled by an interference effect between the vacuum fluctuation and the fluctuating motion. In fact, in the case of an internal detector where the Heisenberg equation of motion can be solved exactly, there is no additional radiation after the thermalization is completed [D. J. Raine, D. W. Sciama, and P. G. Grove, Proc. R. Soc. Lond. A 435, 205 (1991).][A. Raval, B. L. Hu, and J. Anglin, Phys. Rev. D 53, 7003 (1996).]. In this paper, we revisit the issue in the case of an accelerated charged particle in the scalar-field analog of QED. We prove the equipartition theorem of transverse momenta by investigating a stochastic motion of the particle, and show that the Unruh radiation is partially canceled by an interference effect.