德西特空间和永久移动
De Sitter space and perpetuum mobile
摘要：
我们给出一般的论点，任何相互作用的非共形{ \it经典}场论在德西特空间导致的可能性，建设一个永久移动。这些论点是基于这样的观察，即自由落体的大质量粒子可以辐射自由落体观察者所看到的经典水平上的其他大质量粒子。辐射过程的强度是非零的，即使对于具有任何有限质量的粒子，即具有在因果域内的波长。因此，我们得出结论，要么德西特空间不能永远存在，或者可以建立一个永久的移动。
英文摘要：
We give general arguments that any interacting non--conformal {\it classical} field theory in de Sitter space leads to the possibility of constructing a perpetuum mobile. The arguments are based on the observation that massive free falling particles can radiate other massive particles on the classical level as seen by the free falling observer. The intensity of the radiation process is non-zero even for particles with any finite mass, i.e. with a wavelength which is within the causal domain. Hence, we conclude that either de Sitter space can not exist eternally or that one can build a perpetuum mobile.
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