De Sitter space and perpetuum mobile

Understand

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.