Zobrazeno 1 - 10
of 697
pro vyhledávání: '"Gunzig, E."'
Publikováno v:
Int.J.Theor.Phys. 42 (2003) 1153-1161
We consider here the dynamics of some homogeneous and isotropic cosmological models with $N$ interacting classical scalar fields non-minimally coupled to the spacetime curvature, as an attempt to generalize some recent results obtained for one and tw
Externí odkaz:
http://arxiv.org/abs/gr-qc/0305011
Publikováno v:
Int.J.Theor.Phys. 42 (2003) 1145-1152
We investigate the dynamics of Einstein equations in the vicinity of the two recently described types of singularity of anisotropic and homogeneous cosmological models described by the action $$ S=\int d^4x \sqrt{-g}{F(\phi)R - \partial_a\phi\partial
Externí odkaz:
http://arxiv.org/abs/gr-qc/0305008
Publikováno v:
Mod.Phys.Lett. A18 (2003) 1043
We show that the action of Einstein's gravity with a scalar field coupled in a generic way to spacetime curvature is invariant under a particular set of conformal transformations. These transformations relate dual theories for which the effective cou
Externí odkaz:
http://arxiv.org/abs/gr-qc/0305009
Publikováno v:
Int.J.Theor.Phys. 41 (2002) 2037-2046
We discuss the implication of the introduction of an extra field to the dynamics of a scalar field conformally coupled to gravitation in a homogeneous isotropic spatially flat universe. We show that for some reasonable parameter values the dynamical
Externí odkaz:
http://arxiv.org/abs/gr-qc/0210090
Publikováno v:
Phys.Lett. B549 (2002) 13-19
We show that Einstein's gravity coupled to a non-minimally coupled scalar field is stable even for high values of the scalar field, when the sign of the Einstein-Hilbert action is reversed. We also discuss inflationary solutions and a possible new me
Externí odkaz:
http://arxiv.org/abs/gr-qc/0205022
Publikováno v:
Int.J.Theor.Phys. 40 (2001) 2295
We consider the dynamics of a spatially flat universe dominated by a self-interacting nonminimally coupled scalar field. The structure of the phase space and complete phase portraits for the conformal coupling case are given. It is shown that the non
Externí odkaz:
http://arxiv.org/abs/gr-qc/0012105
Publikováno v:
Phys.Rev. D63 (2001) 067301
The dynamics of a universe dominated by a self-interacting nonminimally coupled scalar field are considered. The structure of the phase space and complete phase portraits are given. New dynamical behaviors include superinflation ($\dot{H}>0$), avoida
Externí odkaz:
http://arxiv.org/abs/gr-qc/0012085
Publikováno v:
Class.Quant.Grav.15:923-932,1998
We present a simple and thermodynamically consistent cosmology with a phenomenological model of quantum creation of radiation due to vacuum decay. Thermodynamics and Einstein's equations lead to an equation in which $H$ is determined by the particle
Externí odkaz:
http://arxiv.org/abs/astro-ph/9703137