dorsal/arxiv
View SchemaCorrelation of energy and free energy for the thermal Casimir force between real metals
| Authors | V. B. Bezerra, G. L. Klimchitskaya, V. M. Mostepanenko |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0210209 |
| URL | https://arxiv.org/abs/quant-ph/0210209 |
| DOI | 10.1103/PhysRevA.66.062112 |
| Journal | Phys. Rev. A, v.66, N6, p.062112-(1-13), 2002 |
Abstract
The energy of fluctuating electromagnetic field is investigated for the thermal Casimir force acting between parallel plates made of real metal. It is proved that for nondissipative media with temperature independent dielectric permittivity the energy at nonzero temperature comprises of the (renormalized) energies of the zero-point and thermal photons. In this manner photons can be considered as collective elementary excitations of the matter of plates and electromagnetic field. If the dielectric permittivity depends on temperature the energy contains additional terms proportional to the derivatives of dielectric permittivity with respect to temperature, and the quasiparticle interpretation of the fluctuating field is not possible. The correlation between energy and free energy is considered. Previous calculations of the Casimir energy in the framework of the Lifshitz formula at zero temperature and optical tabulated data supplemented by the Drude model at room temperature are analysed. It is demonstrated that this quantity is not a good approximation either for the free energy or the energy. A physical interpretation of this hybrid quantity is suggested. The contradictory results in the recent literature on whether the zero-frequency term of the Lifshitz formula for the perpendicular polarized modes has any effective contribution to the physical quantities are discussed. Four main approaches to the resolution of this problem are specified. The precise expressions for entropy of the fluctuating field between plates made of real metal are obtained, which helps to decide between the different approaches. The conclusion is that the Lifshitz formula supplemented by the plasma model and the surface impedance approach are best suited to describe the thermal Casimir force between real metals.
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"abstract": "The energy of fluctuating electromagnetic field is investigated for the\nthermal Casimir force acting between parallel plates made of real metal. It is\nproved that for nondissipative media with temperature independent dielectric\npermittivity the energy at nonzero temperature comprises of the (renormalized)\nenergies of the zero-point and thermal photons. In this manner photons can be\nconsidered as collective elementary excitations of the matter of plates and\nelectromagnetic field. If the dielectric permittivity depends on temperature\nthe energy contains additional terms proportional to the derivatives of\ndielectric permittivity with respect to temperature, and the quasiparticle\ninterpretation of the fluctuating field is not possible. The correlation\nbetween energy and free energy is considered. Previous calculations of the\nCasimir energy in the framework of the Lifshitz formula at zero temperature and\noptical tabulated data supplemented by the Drude model at room temperature are\nanalysed. It is demonstrated that this quantity is not a good approximation\neither for the free energy or the energy. A physical interpretation of this\nhybrid quantity is suggested. The contradictory results in the recent\nliterature on whether the zero-frequency term of the Lifshitz formula for the\nperpendicular polarized modes has any effective contribution to the physical\nquantities are discussed. Four main approaches to the resolution of this\nproblem are specified. The precise expressions for entropy of the fluctuating\nfield between plates made of real metal are obtained, which helps to decide\nbetween the different approaches. The conclusion is that the Lifshitz formula\nsupplemented by the plasma model and the surface impedance approach are best\nsuited to describe the thermal Casimir force between real metals.",
"arxiv_id": "quant-ph/0210209",
"authors": [
"V. B. Bezerra",
"G. L. Klimchitskaya",
"V. M. Mostepanenko"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.66.062112",
"journal_ref": "Phys. Rev. A, v.66, N6, p.062112-(1-13), 2002",
"title": "Correlation of energy and free energy for the thermal Casimir force between real metals",
"url": "https://arxiv.org/abs/quant-ph/0210209"
},
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