Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-05-11
Grav. Cosmol.16:92-104, 2010
Physics
High Energy Physics
High Energy Physics - Theory
18 pages, 4 figures. Paper accepted for publication in Gravitation & Cosmology
Scientific paper
10.1134/S0202289310020027
In this paper we analyse the vacuum polarization effects associated with massive scalar quantum fields in a higher-dimensional de Sitter space in the presence of a global monopole. Because this analysis has been developed in a pure de Sitter space, here we are mainly interested on the effects induced by the presence of the global monopole. So, in order to achieve this objective we calculate the corresponding Wightman function, which is expressed in an integral representation and explicitly depends on the parameters associated with the presence of the monopole and the cosmological constant. Admitting that the former is closed to the unity, which corresponds to a realistic value predicted by Grand Unified Theories, it is possible to express this function as the sum of two terms: the first one corresponds to the Wightman function on the bulk where the global monopole is absent, and the second one is a contribution induced by the presence of the monopole.
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