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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, RUBÍ CAPACETI, José miguel. Theory of Casimir forces without the Proximity-Force approximation. _Physical Review Letters_. 2016. Vol. 116, núm. 11, pàgs. 110601-110601-5. [consulta: 27 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/132843]

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