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arXiv 1602.02526hep-thgr-qc
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动镜与涨落耗散定理

Moving mirrors and the fluctuation-dissipation theorem

D. Jaffino Stargen, Dawood Kothawala, L. Sriramkumar

摘要:

本文研究了(1 + 1)维空间中浸没在无质量标量粒子热浴中的镜子的随机运动,这些粒子通过边界条件与镜子相互作用。在运动反射镜上施加Dirichlet或Neumann边界条件,求出反射镜上的平均辐射反作用力和描述该反作用力关于平均值的涨落的关联函数。从这样得到的关联函数,我们明确地建立了支配运动反射镜的涨落耗散定理。利用涨落耗散定理,我们计算了有限温度和零温度下反射镜的均方位移。我们澄清了几点有关的各种限制行为的均方位移的镜子。当我们在有限温度下恢复标准结果时,我们发现镜面在零温度下扩散,证实了在此背景下早些时候得出的类似结论。我们还评论了一个微妙的关于零温度极限的有限温度结果和精确的零温度结果之间的比较。

英文摘要:

We investigate the random motion of a mirror in (1 + 1)-dimensions that is immersed in a thermal bath of massless scalar particles which are interacting with the mirror through a boundary condition. Imposing the Dirichlet or the Neumann boundary conditions on the moving mirror, we evaluate the mean radiation reaction force on the mirror and the correlation function describing the fluctuations in the force about the mean value. From the correlation function thus obtained, we explicitly establish the fluctuation-dissipation theorem governing the moving mirror. Using the fluctuation-dissipation theorem, we compute the mean-squared displacement of the mirror at finite and zero temperature. We clarify a few points concerning the various limiting behavior of the mean-squared displacement of the mirror. While we recover the standard result at finite temperature, we find that the mirror diffuses logarithmically at zero temperature, confirming similar conclusions that have been arrived at earlier in this context. We also comment on a subtlety concerning the comparison between zero temperature limit of the finite temperature result and the exact zero temperature result.

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