The Lamb shift in de Sitter spacetime

Details The Lamb shift in de Sitter spacetime The Lamb shift in de Sitter spacetime

2010-12-18

arxiv.org/abs/1012.4055v1

Phys.Rev.D82:124067,2010

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, no figures, accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.82.124067

We study the Lamb shift of both freely-falling and static two-level atoms in interaction with quantized conformally coupled massless scalar fields in the de Sitter-invariant vacuum. We find that the Lamb shifts of both freely-falling and static atoms are in structural similarity to that of an inertial atom immersed in a thermal bath in a Minkowski spacetime. For the freely-falling atom, the Lamb shift gets a correction as if it was immersed in a thermal bath at the Gibbons-Hawking temperature, thus revealing clearly the intrinsic thermal nature of de Sitter spacetime. For the static atom, the Lamb shift is affected by a combination of the effect of the intrinsic thermal nature of de Sitter spacetime and the Unruh effect associated with the inherent acceleration of the atom.

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