Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-03-21
Physics
High Energy Physics
High Energy Physics - Theory
7 pages
Scientific paper
Instabilities of two dimensional (1+1) de Sitter space induced by interacting fields are studied. As for the case of flat Minkowski space, several interacting fermion models can be translated into free boson ones and vice versa. It is found that interacting fermion theories do not lead to any instabilities, while the interacting bosonic sine-Gordon model does lead to a breakdown of de Sitter symmetry and to the vanishing of the vacuum expectation value of the S matrix.
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