Cosmological dynamics of multifield dark energy

Abstract

We numerically and analytically explore the background cosmological dynamics of multifield dark energy with highly nongeodesic or "spinning" field-space trajectories. These extensions of standard single-field quintessence possess appealing theoretical features and observable differences from the cosmological standard model. At the level of the cosmological background, we perform a phase-space analysis and identify approximate attractors with late-time acceleration for a wide range of initial conditions. Focusing on two classes of field-space geometry, we derive bounds on parameter space by demanding viable late-time acceleration and the absence of gradient instabilities, as well as from the de Sitter swampland conjecture.

arXiv comment19 pages, 12 figures. v2: Improved and published version

References in corpus (50)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Dynamics of dark energy
• Modified Gravity and Cosmology
• de Sitter Vacua in String Theory
• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• String Axiverse
• Beyond the Cosmological Standard Model
• Cosmology and Fundamental Physics with the Euclid Satellite
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
• The Swampland: Introduction and Review
• Flux Compactification
• Distance and de Sitter Conjectures on the Swampland
• Cosmological Tests of Modified Gravity
• On the Cosmological Implications of the String Swampland
• Beyond $\Lambda$CDM: Problems, solutions, and the road ahead
• Testing General Relativity in Cosmology
• Bounds on Slow Roll and the de Sitter Swampland
• Features of heavy physics in the CMB power spectrum
• Scalar perturbations during multiple-field slow-roll inflation
• The landscape, the swampland and the era of precision cosmology
• Curvature and isocurvature perturbations in two-field inflation
• Effective theories of single field inflation when heavy fields matter
• The string swampland constraints require multi-field inflation
• Cosmological Tests of Gravity
• Mass hierarchies and non-decoupling in multi-scalar field dynamics
• Spintessence! New Models for Dark Matter and Dark Energy
• De Sitter vs Quintessence in String Theory
• Heavy fields, reduced speeds of sound and decoupling during inflation
• Dark energy, $\alpha$-attractors, and large-scale structure surveys
• Geometrical Destabilization of Inflation
• Curvature Perturbation Spectrum in Two-field Inflation with a Turning Trajectory
• Hyperinflation
• A comment on effective field theories of flux vacua
• M-flation: Inflation From Matrix Valued Scalar Fields
• Universality of multi-field $\alpha$-attractors
• dS Vacua and the Swampland
• Dynamics of assisted quintessence
• Out of the Swampland with Multifield Quintessence?
• New accelerating solutions in late-time cosmology
• Multi-field dark energy: cosmic acceleration on a steep potential
• Yoga Dark Energy: Natural Relaxation and Other Dark Implications of a Supersymmetric Gravity Sector
• Quintessence dynamics with two scalar fields and mixed kinetic terms
• Axion Homeopathy: Screening Dilaton Interactions
• The Multi-Field, Rapid-Turn Inflationary Solution
• How can we tell whether dark energy is composed by multiple fields?
• Dark Energy from Inspiraling in Field Space
• Linear Density Perturbations in Multifield Coupled Quintessence
• Cosmology with a Continuous Tower of Scalar Fields