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The thermal Casimir force between two metallic plates is known to depend onthe description of material properties. For large separations the dissipativeDrude model leads to a force a factor of 2 smaller than the lossless plasmamodel. Here we show that the plane-sphere geometry, in which current experimentare performed, decreases this ratio to a factor of 3/2, as revealed by exactnumerical and large distance analytical calculations. For perfect reflectors,we find a repulsive contribution of thermal photons to the force and negativeentropy values at intermediate distances.

Thermal Casimir Effect in the Plane-Sphere Geometry