Derivative expansion for the electromagnetic Casimir free energy at high temperatures

We study the contribution of the thermal zero modes to the Casimir free energy in the case of a fluctuating electromagnetic (EM) field in the presence of real materials described by frequency-dependent, local and isotropic permittivity (ε) and permeability (μ) functions. Those zero modes, present at...

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Autores principales:	Fosco, C.D., Lombardo, F.C., Mazzitelli, F.D.
Formato:	JOUR
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_15507998_v92_n12_p_Fosco
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_15507998_v92_n12_p_Fosco
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spelling	todo:paper_15507998_v92_n12_p_Fosco2023-10-03T16:25:13Z Derivative expansion for the electromagnetic Casimir free energy at high temperatures Fosco, C.D. Lombardo, F.C. Mazzitelli, F.D. We study the contribution of the thermal zero modes to the Casimir free energy in the case of a fluctuating electromagnetic (EM) field in the presence of real materials described by frequency-dependent, local and isotropic permittivity (ε) and permeability (μ) functions. Those zero modes, present at any finite temperature, become dominant at high temperatures since the theory is dimensionally reduced. Our work, within the context of the derivative expansion (DE) approach, focuses on the emergence of nonanalyticities in that dimensionally reduced theory. We conclude that the DE is well defined whenever the function Ω(ω), defined by [Ω(ω)]2≡ω2ε(ω), vanishes in the zero-frequency limit for at least one of the two material media involved. © 2015 American Physical Society. Fil:Lombardo, F.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mazzitelli, F.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15507998_v92_n12_p_Fosco
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description	We study the contribution of the thermal zero modes to the Casimir free energy in the case of a fluctuating electromagnetic (EM) field in the presence of real materials described by frequency-dependent, local and isotropic permittivity (ε) and permeability (μ) functions. Those zero modes, present at any finite temperature, become dominant at high temperatures since the theory is dimensionally reduced. Our work, within the context of the derivative expansion (DE) approach, focuses on the emergence of nonanalyticities in that dimensionally reduced theory. We conclude that the DE is well defined whenever the function Ω(ω), defined by [Ω(ω)]2≡ω2ε(ω), vanishes in the zero-frequency limit for at least one of the two material media involved. © 2015 American Physical Society.
format	JOUR
author	Fosco, C.D. Lombardo, F.C. Mazzitelli, F.D.
spellingShingle	Fosco, C.D. Lombardo, F.C. Mazzitelli, F.D. Derivative expansion for the electromagnetic Casimir free energy at high temperatures
author_facet	Fosco, C.D. Lombardo, F.C. Mazzitelli, F.D.
author_sort	Fosco, C.D.
title	Derivative expansion for the electromagnetic Casimir free energy at high temperatures
title_short	Derivative expansion for the electromagnetic Casimir free energy at high temperatures
title_full	Derivative expansion for the electromagnetic Casimir free energy at high temperatures
title_fullStr	Derivative expansion for the electromagnetic Casimir free energy at high temperatures
title_full_unstemmed	Derivative expansion for the electromagnetic Casimir free energy at high temperatures
title_sort	derivative expansion for the electromagnetic casimir free energy at high temperatures
url	http://hdl.handle.net/20.500.12110/paper_15507998_v92_n12_p_Fosco
work_keys_str_mv	AT foscocd derivativeexpansionfortheelectromagneticcasimirfreeenergyathightemperatures AT lombardofc derivativeexpansionfortheelectromagneticcasimirfreeenergyathightemperatures AT mazzitellifd derivativeexpansionfortheelectromagneticcasimirfreeenergyathightemperatures
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Derivative expansion for the electromagnetic Casimir free energy at high temperatures

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