MG11 |
Participant |
Bieli, Roger | |
Institution |
Max-Planck-Institute for Gravitational Physics - Am Muehlenberg 1 - Golm - Potsdam - GERMANY | |
Session |
Talk |
Abstract |
COT1 |
Accelerated expansion by non-minimally coupled scalar fields |
Cosmological models including a non-linear scalar field with an explicit coupling either to the space-time curvature or to the matter content are interesting generalizations of quintessence cosmologies. The asymptotics of spatially homogeneous models (Bianchi I to VIII) with the scalar field coupled to ordinary matter and evolving in a positive potential are presented and exponential or intermediate late-time inflation is found. On the other hand, it is shown that a non-minimal coupling to the space-time curvature offers a way to obtain deSitter expansion for exponential potentials of arbitrary steepness, i.e. for potentials where apparently no cosmological constant is present. |