17-21 September 2019
Yerevan, Armenia
Etc/GMT+4 timezone

Vacuum polarization by cosmic strings

17 Sep 2019, 11:00
35m
Yerevan, Armenia

Yerevan, Armenia

Department of Physics, Alex Manoogian str. 1, Yerevan, Armenia

Speaker

Prof. Aram Saharian (Department of Physics, Yerevan State University)

Description

We investigate the polarization of the vacuum for scalar, fermionic and electromagnetic fields induced by cosmic strings. Locally Minkowski, de Sitter and anti-de Sitter background geometries are considered. As local characteristics of the vacuum the expectation values of the field squared and of the energy-momentum tensor are considered. The contributions induced by the nontrivial topology of a cosmic string are explicitly extracted. The asymptotic behavior of the vacuum expectation values is discussed near the string and at large distances. For the de Sitter and anti-de Sitter geometries the influence of the gravitational filed on the vacuum characteristics is essential at proper distances from the string larger than the curvature radius of the background spacetime.

Primary author

Prof. Aram Saharian (Department of Physics, Yerevan State University)

Presentation Materials