2018/07/19 by A. A. Saharian, V. F. Manukyan, N. A. Saharyan
Physics and Astronomy · #hep-th
paper · pdf · doi:10.3390/particles1010013
published as Particles 1 (2018) 13 · 19 pages, 5 figures. arXiv admin note: text overlap with arXiv:1706.00749
arxiv created 2018/07/19 · arxiv updated 2018/07/24
We investigate the influence of a generalized cosmic string in (D+1) -dimensional spacetime on the local characteristics of the electromagnetic vacuum. Two special cases are considered with flat and locally de Sitter background geometries. The topological contributions in the vacuum expectation values (VEVs) of the squared electric and magnetic fields are explicitly separated. Depending on the number of spatial dimensions and on the planar angle deficit induced by the cosmic string, these contributions can be either negative or positive. In the case of the flat bulk, the VEV of the energy-momentum tensor is evaluated as well. For the locally de Sitter bulk, the influence of the background gravitational field essentially changes the behavior of the vacuum densities at distances from the string larger than the curvature radius of the spacetime.