Dynamics of assisted quintessence
arXiv:astro-ph/0506076 · doi:10.1103/PhysRevD.72.043506
Abstract
We explore the dynamics of assisted quintessence, where more than one scalar field is present with the same potential. For potentials with tracking solutions, the fields naturally approach the same values; in the context of inflation this leads to the assisted inflation phenomenon where several fields can cooperate to drive a period of inflation though none is able to individually. For exponential potentials, we study the fixed points and their stability confirming results already in the literature, and then carry out a numerical analysis to show how assisted quintessence is realized. For inverse power-law potentials, we find by contrast that there is no assisted behaviour; indeed those are the unique (monotonic) potentials where several fields together behave just as a single field in the same potential. More generally, we provide an algorithm for generating a single-field potential giving equivalent dynamics to multi-field assisted quintessence.
6 pages RevTeX4 with three figures. Significant updates, version accepted by Physical Review D. Critical point analysis with two exponential potentials was already carried out by Coley and van den Hoogen in gr-qc/9911075 . Extra numerical analysis added and additional references. Overall conclusions unchanged
References in corpus (34)
- Cosmological parameters from SDSS and WMAP
- Cosmological Constant - the Weight of the Vacuum
- The Case for a Positive Cosmological Lambda-term
- Cosmology and the Fate of Dilatation Symmetry
- Quintessence, Cosmic Coincidence, and the Cosmological Constant
- Coupled Quintessence
- Cosmological Tracking Solutions
- Exponential potentials and cosmological scaling solutions
- Dark Energy Constraints from the Cosmic Age and Supernova
- Properties of singularities in (phantom) dark energy universe
- Cosmological parameter analysis including SDSS Ly-alpha forest and galaxy bias: constraints on the primordial spectrum of fluctuations, neutrino mass, and dark energy
- Cosmology with a Primordial Scaling Field
- Cosmological Evolution of a Quintom Model of Dark Energy
- Quintessence arising from exponential potentials
- A classification of scalar field potentials with cosmological scaling solutions
- Structure formation with a self-tuning scalar field
- Is there Supernova Evidence for Dark Energy Metamorphosis ?
- Assisted inflation
- WMAP constraints on low redshift evolution of dark energy
- Dilatonic ghost condensate as dark energy
- Crossing the Phantom Divide: Dark Energy Internal Degrees of Freedom
- Cosmological parameters from supernova observations: A critical comparison of three data sets
- What is needed of a tachyon if it is to be the dark energy?
- Coupled dark energy: Towards a general description of the dynamics
- The foundations of observing dark energy dynamics with the Wilkinson Microwave Anisotropy Probe
- A unified approach to scaling solutions in a general cosmological background
- Applications of scalar attractor solutions to Cosmology
- General Scalar Fields as Quintessence
- The Dynamics of Multi-Scalar Field Cosmological Models and Assisted Inflation
- Accelerating Cosmologies from Exponential Potentials
- Quintessence Model With Double Exponential Potential
- Phase Space Analysis of Quintessence Cosmologies with a Double Exponential Potential
- Transient Accelerated Expansion and Double Quintessence
- Scalar Cosmology with Multi-exponential Potentials
Cited by in corpus (38)
- Dynamics of dark energy
- Quintessence: A Review
- Dynamical systems applied to cosmology: dark energy and modified gravity
- Constraints on scalar-tensor models of dark energy from observational and local gravity tests
- String-inspired cosmology: Late time transition from scaling matter era to dark energy universe caused by a Gauss-Bonnet coupling
- General analytic formulae for attractor solutions of scalar-field dark energy models and their multi-field generalizations
- Exact Analysis of Scaling and Dominant Attractors Beyond the Exponential Potential
- A Quintom scenario with mixed kinetic terms
- Noether Symmetry Approach in multiple scalar fields Scenario
- Stability Analysis in Tachyonic Potential Chameleon cosmology
- Unveiling the Dynamics of the Universe
- Dark energy: investigation and modeling
- Assisted coupled quintessence
- Multi-field dark energy: cosmic acceleration on a steep potential
- No H_0 Assistance from Assisted Quintessence
- Dynamics of Generalized Assisted Inflation
- A new approach in stability analysis: case study: tachyon cosmology with non-minimally coupled scalar field-matter
- Quintessence dynamics with two scalar fields and mixed kinetic terms
- Assisted dark energy
- Stability of multi-field cosmological solutions
- First-order formalism for dark energy and dust
- Cosmological Scaling Solutions for Multiple Scalar Fields
- Dark Energy from Inspiraling in Field Space
- Observational constraints on assisted k-inflation
- Cosmological dynamics of multifield dark energy
- The dynamics of coset dimensional reduction
- Dark energy with the help of interacting dark sectors
- Quadratic integrals of a multi-scalar cosmological model
- Dynamics of entropy perturbations in assisted dark energy with mixed kinetic terms
- Dynamics of tachyon field in spatially curved FRW universe
- Dynamics of two-scalar-field cosmological models beyond the exponential potential
- Quintom fields from chiral anisotropic cosmology
- Stability of multi-field cosmological solutions in the presence of a fluid
- Gravitational Coupling, Dynamical Changes of Units and The Cosmological Constant Problem
- Dark energy without fine tuning
- DESI constraints on two-field quintessence with exponential potentials
- 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