Abstract
The force experienced by a mirror moving in vacuum vanishes in the case of
uniform velocity or uniform acceleration, as a consequence of spatial
symmetries of vacuum. These symmetries do not subsist in a thermal field. We
give a general expression of the corresponding viscosity coefficient valid at
any temperature and for any reflectivity function. We show that the computed
motional force also contains a non vanishing inertial term. The associated mass
correction goes to zero in the limiting cases of perfect reflection or of zero
temperature.
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