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

Electromagnetic vacuum densities around a cosmic string in de Sitter spacetime

18 Sep 2019, 15:30
Yerevan, Armenia

Yerevan, Armenia

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


Dr Vardan Manukyan (Shirak State University)


We evaluate the vacuum expectation values (VEVs) of the electric and magnetic fields squared and of the energy-momentum tensor for the electromagnetic field around a cosmic string on the background of (D+1)-dimensional locally de Sitter spacetime. It is assumed that the field is prepared in the Bunch-Davies vacuum state. The topological contributions in the VEVs are explicitly separated. It is shown that in spatial dimensions other than 3 the part of the vacuum energy-momentum tensor induced by the cosmic string, in addition to the diagonal components, has a nonzero off-diagonal component corresponding to the energy flux along the radial direction. The asymptotic behavior of the VEVs is discussed near the string and at proper distances larger than the curvature radius of the de Sitter spacetime.

Primary authors

Prof. Aram Saharian (Yerevan State University ) Dr Vardan Manukyan (Shirak State University) Dr Nvard Saharyan (Yerevan State University)

Presentation Materials