Sommaire:

Imposing boundary conditions on the quantum vacuum can have interesting consequences. An example is the Casimir effect where fluctuations of the electromagnetic field lead to a force between metallic or dielectric objects. Accounting not only for quantum fluctuations but also for thermal fluctuations of the electromagnetic field, thermodynamic aspects of the Casimir effect can be studied. Interestingly, it was found that the entropy can become negative under appropriate circumstances. In particular, the dissipative nature of the objects involved as well as their geometrical shape are of relevance. We will explain the meaning of a negative Casimir entropy and its dissipative and
geometric origins.

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