2014/04/27 by A. A. Saharian, A A Saharian, V. F. Manukyan +1 · 5 citations
Physics and Astronomy · #Boundary value problem #Casimir effect #Cosmology and Gravitation Theories #Curvature #Field (mathematics) #Noncommutative and Quantum Gravity Theories #Quantum Electrodynamics and Casimir Effect #Quantum field theory in curved spacetime #Scalar (mathematics) #Scalar field #Shell (structure) #Spacetime #Tensor (intrinsic definition) #gr-qc #hep-th #quant-ph
paper · pdf · doi:10.1088/0264-9381/32/2/025009
published in Classical and Quantum Gravity 32(2), 025009 (IOP Publishing) · 22 pages, 3 figures
arxiv created 2014/04/27 · openalex publication_date 2014/12/18 · arxiv updated 2014/12/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We evaluate the positive-frequency Wightman function, the vacuum expectation values (VEVs) of the field squared and the energy-momentum tensor for a massive scalar field with general curvature coupling for a cylindrical shell in background of dS spacetime. The field is prepared in the Bunch-Davies vacuum state and on the shell the corresponding operator obeys Robin boundary condition. In the region inside the shell and for non-Neumann boundary conditions, the Bunch-Davies vacuum is a physically realizable state for all values of the mass and curvature coupling parameter. For both interior and exterior regions, the VEVs are decomposed into boundary-free dS and shell-induced parts. We show that the shell-induced part of the vacuum energy-momentum tensor has a nonzero off-diagonal component corresponding to the energy flux along the radial direction. Unlike to the case of a shell in Minkowski bulk, for dS background the axial stresses are not equal to the energy density. In dependence of the mass and of the coefficient in the boundary condition, the vacuum energy density and the energy flux can be either positive or negative. The influence of the background gravitational field on the boundary-induced effects is crucial at distances from the shell larger than the dS curvature scale. In particular, the decay of the VEVs with the distance is power-law (monotonic or oscillatory with dependence of the mass) for both massless and massive fields. For Neumann boundary condition the decay is faster than that for non-Neumann conditions.