标题： 热背景中的反乌尔赫效应 显示英文标题

标题： Anti-Unruh effect in the thermal background

摘要： 我们研究了热背景对反乌赫效应存在性的影响。对于无质量标量场，我们提出当探测器在热场中加速时，反乌赫效应会出现，而当在闵可夫斯基真空下加速时，这种效应则不存在。对于有质量的标量场，发现在真空中加速的探测器中存在的反乌赫效应，在背景温度升高时可能会消失。我们使用多体纠缠量子态来研究有质量标量场的情况。当多体状态被加速时，随着背景温度的增加，其纠缠度会减少，并且会发生纠缠突然死亡的现象。这提供了一个有价值的指示，即反乌赫效应可以在低于特定背景温度的情况下存在，这一温度依赖于实际的实验环境。 显示英文摘要

摘要： We study the influence of the thermal background on the existence of the anti-Unruh effect. For the massless scalar field, we present that the anti-Unruh effect can appear when the detector is accelerated in the thermal field, which is shown to be absent when accelerating in the Minkowski vacuum. For the massive scalar field, it is found that the anti-Unruh effect which exists in the case for accelerated detectors in the vacuum can disappear when the background temperature increases. We use the many-body entangled quantum state to study the situation of the massive scalar field. When the many-body state is accelerated, its entanglement is decreasing with the increase of the background temperature and the phenomenon of the sudden death for entanglement occurs. This provides a valuable indication that the anti-Unruh effect can exist below some specific background temperature, dependent on the actual experimental environment.