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Theory of Casimir forces without the Proximity-Force approximation
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We analyze both the attractive and repulsive Casimir-Lifshitz forces recently reported in experimental investigations. By using a kinetic approach, we obtain the Casimir forces from the power absorbed by the materials. We consider collective material excitations through a set of relaxation times distributed in frequency according to a log-normal function. A generalized expression for these forces for arbitrary values of temperature is obtained. We compare our results with experimental measurements and conclude that the model goes beyond the proximity-force approximation.
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LAPAS, Luciano Calheiros, PÉREZ MADRID, Agustín and RUBÍ CAPACETI, José Miguel. Theory of Casimir forces without the Proximity-Force approximation. Physical Review Letters. 2016. Vol. 116, num. 11, pags. 110601-110601-5. ISSN 0031-9007. [consulted: 10 of July of 2026]. Available at: https://hdl.handle.net/2445/132843