Publication Details:

Established in 2008

Journal or Publication Title:

Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես

Date of publication:

2021

Volume:

14

Number:

4

ISSN:

1829-1171

Official URL:

Corporate Creators:

Yerevan State University, Department of Physics

Coverage:

180-190

Abstract:

The vacuum expectation values of the field squared and energy-momentum tensor for a massless scalar field are investigated in the Milne universe with general number of spatial dimensions. The vacuum state depends on the choice of the mode functions in the canonical quantization procedure and we assume that the field is prepared in the conformal vacuum. As the first step an integral representation for the difference of the Wightman functions corresponding to the conformal and Minkowski vacua is derived. The mean field squared and energy-momentum tensor are obtained in the coincidence limit. It is shown that the Minkowski vacuum state is interpreted as a thermal one with respect to the conformal vacuum. The thermal factor is of the Bose-Einstein type in odd dimensional space and of the Fermi-Dirac type in even number of spatial dimensions.

Format:

pdf

Identifier:

click here to follow the link ; oai:arar.sci.am:296619

Location of original object:

ՀՀ ԳԱԱ Հիմնարար գիտական գրադարան