par Abramo, Luís Raul Weber;Brenig, Léon 
;Gunzig, Edgard
Référence International journal of modern physics D, 11, 10, page (1531-1536)
Publication Publié, 2002-12
;Gunzig, Edgard Référence International journal of modern physics D, 11, 10, page (1531-1536)
Publication Publié, 2002-12
Article révisé par les pairs
| Résumé : | In Einstein's gravity, non-minimal coupling of a scalar field to the scalar curvature leads to a paradoxical situation. On the one hand, it opens the way to qualitatively new cosmological dynamics. On the other hand, there are sectors of non-minimally coupled scalar-gravity theories for which the Einstein-Hilbert action reverses its sign, which seems to indicate that the whole system is unstable. We show how conformal coupling bypasses this problem. Due to a subtle interplay between gravity and the scalar field, classical and quantum stability are guaranteed globally. This liberates conformal coupling from a serious obstacle. Inflationary solutions in the new sector are also presented, which are validated by current observations. |
