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Conformally invariant fields in conformally flat spacetime

par Van Den Bergh, Norbert V D N.;Gunzig, Edgard ;Nardone, Pasquale ;Castagnino, Mario
Référence Classical and quantum gravity, 7, 12, page (2267-2283), 009
Publication Publié, 1990

Article révisé par les pairs

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Résumé :

The authors study conformally invariant fields within the context of semiclassical gravity. They claim that, with a single exception, exact conformally flat solutions are necessarily Friedmann-Robertson-Walker models or their tachyonic fluid analogues. In both cases they rewrite the field equations as a quadratic three-dimensional autonomous system of ordinary differential equations, the critical points of which are Minkowski space and (anti-) de Sitter space. Both Minkowski and de Sitter space are unstable in the linear as well as in the non-linear theory.