Quintessence dynamics with two scalar fields and mixed kinetic terms
arXiv:0910.1934 · doi:10.1103/PhysRevD.80.123014
Abstract
The dynamical properties of a model of dark energy in which two scalar fields are coupled by a non-canonical kinetic term are studied. We show that overall the addition of the coupling has only minor effects on the dynamics of the two-field system for both potentials studied, even preserving many of the features of the assisted quintessence scenario. The coupling of the kinetic terms enlarges the regions of stability of the critical points. When the potential is of an additive form, we find the kinetic coupling has an interesting effect on the dynamics of the fields as they approach the inflationary attractor, with the result that the combined equation of state of the scalar fields can approach -1 during the transition from a matter dominated universe to the recent period of acceleration.
14 pages, 9 figures. Includes a extra section describing the case of a field-dependent coupling with two additional figures and minor changes to match published version
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- Multi-field dark energy: cosmic acceleration on a steep potential
- Anisotropic power-law inflation in a two-scalar-field model with a mixed kinetic term
- Cosmological Scaling Solutions for Multiple Scalar Fields
- Cosmological dynamics of multifield dark energy
- Unified dark matter and dark energy description in a chiral cosmological model
- Dynamics of entropy perturbations in assisted dark energy with mixed kinetic terms
- Quintom fields from chiral anisotropic cosmology
- Dark energy without fine tuning
- Gravitational Coupling, Dynamical Changes of Units and The Cosmological Constant Problem
- DESI constraints on two-field quintessence with exponential potentials
- Stability of multi-field cosmological solutions in the presence of a fluid
- A gap between two approaches of dimensional reduction for a six-dimensional Kaluza-Klein theory
- Towards a de Sitter quintom-like cosmology from a reduction of a 7-dimensional theory
- Modified Power law Inflation: solution to the graceful exit problem and improvement of dark energy models
- Stringy multifield quintessence and the Swampland