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Abstract:

We apply the derivative expansion approach to the Casimir effect for a real scalar field in d spatial dimensions to calculate the next-to-leading-order term in that expansion, namely, the first correction to the proximity force approximation. The field satisfies either Dirichlet or Neumann boundary conditions on two static mirrors, one of them flat and the other gently curved. We show that, for Dirichlet boundary conditions, the next-to-leading-order term in the Casimir energy is of quadratic order in derivatives, regardless of the number of dimensions. Therefore, it is local and determined by a single coefficient. We show that the same holds true, if d*2, for a field which satisfies Neumann conditions. When d=2, the next-to-leading-order term becomes nonlocal in coordinate space, a manifestation of the existence of a gapless excitation (which does exist also for d>2, but produces subleading terms). We also consider a derivative expansion approach including thermal fluctuations of the scalar field. We show that, for Dirichlet mirrors, the next-to-leading- order term in the free energy is also local for any temperature T. Besides, it interpolates between the proper limits: when T→0, it tends to the one we had calculated for the Casimir energy in d dimensions, while for T→∞, it corresponds to the one for a theory in d-1 dimensions, because of the expected dimensional reduction at high temperatures. For Neumann mirrors in d=3, we find a nonlocal next-to-leading-order term for any T>0. © 2012 American Physical Society.

Registro:

Documento: Artículo
Título:Derivative expansion for the Casimir effect at zero and finite temperature in d+1 dimensions
Autor:Fosco, C.D.; Lombardo, F.C.; Mazzitelli, F.D.
Filiación:Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, R8402AGP Bariloche, Argentina
Instituto Balseiro, Universidad Nacional de Cuyo, R8402AGP Bariloche, Argentina
Departamento de Física Juan José Giambiagi, FCEyN UBA, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón i, 1428 Buenos Aires, Argentina
Año:2012
Volumen:86
Número:4
DOI: http://dx.doi.org/10.1103/PhysRevD.86.045021
Título revista:Physical Review D - Particles, Fields, Gravitation and Cosmology
Título revista abreviado:Phys Rev D Part Fields Gravit Cosmol
ISSN:15507998
CODEN:PRVDA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v86_n4_p_Fosco

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Citas:

---------- APA ----------
Fosco, C.D., Lombardo, F.C. & Mazzitelli, F.D. (2012) . Derivative expansion for the Casimir effect at zero and finite temperature in d+1 dimensions. Physical Review D - Particles, Fields, Gravitation and Cosmology, 86(4).
http://dx.doi.org/10.1103/PhysRevD.86.045021
---------- CHICAGO ----------
Fosco, C.D., Lombardo, F.C., Mazzitelli, F.D. "Derivative expansion for the Casimir effect at zero and finite temperature in d+1 dimensions" . Physical Review D - Particles, Fields, Gravitation and Cosmology 86, no. 4 (2012).
http://dx.doi.org/10.1103/PhysRevD.86.045021
---------- MLA ----------
Fosco, C.D., Lombardo, F.C., Mazzitelli, F.D. "Derivative expansion for the Casimir effect at zero and finite temperature in d+1 dimensions" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 86, no. 4, 2012.
http://dx.doi.org/10.1103/PhysRevD.86.045021
---------- VANCOUVER ----------
Fosco, C.D., Lombardo, F.C., Mazzitelli, F.D. Derivative expansion for the Casimir effect at zero and finite temperature in d+1 dimensions. Phys Rev D Part Fields Gravit Cosmol. 2012;86(4).
http://dx.doi.org/10.1103/PhysRevD.86.045021