Multi-field dark energy: Cosmic acceleration on a steep potential

  title={Multi-field dark energy: Cosmic acceleration on a steep potential},
  author={Yashar Akrami and Misao Sasaki and Adam R. Solomon and Valeri Vardanyan},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},

Figures from this paper

Dark energy from inspiraling in field space

We find an exact solution of the equations of motion of a two-field cosmological model, which realizes multi-field dark energy. The latter is characterized by field-space trajectories with turning

Dynamical consistency conditions for rapid turn inflation

We derive consistency conditions for sustained slow roll and rapid turn inflation in two-field cosmological models with oriented scalar field space, which imply that inflationary models with field-space

The String Swampland and de Sitter Vacua: A Consistent Perspective for Superstrings and Multi-fold Universes

: In a multi-fold universe, gravity emerges from Entanglement through the multi-fold mechanisms. As a result, gravity-like effects appear in between entangled particles that they be real or virtual.

Stringy multifield quintessence and the Swampland

We consider quintessence models within 4D effective descriptions of gravity coupled to two scalar fields. These theories are known to give rise to viable models of late-time cosmic acceleration

Cosmological dynamics of multifield dark energy

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

Multifield mimetic gravity

In this paper, we extend the mimetic gravity to the multi-field setup with a curved field space manifold. The multi-field mimetic scenario is realized via the singular limit of the conformal

Global dynamics of the hyperbolic Chiral-Phantom model

We perform a detailed analysis of the asymptotic behavior of a multi-field cosmological model with phantom terms. Specifically, we consider the Chiral-Phantom model consisting of two scalar fields

On the occurrence of finite-time singularities in Swampland-related quintessence dark energy models

In this work, we focus on the phase space singularities of interactive quintessence model in the presence of matter fluid. This model is related to swampland studies, that the outcomes affect all

Quintessential α-attractor inflation: forecasts for Stage IV galaxy surveys

Single-field models of α-attractor quintessential inflation provide a unified picture of the two periods of early- and late-time cosmic acceleration, where both inflation and dark energy are



Out of the swampland with multifield quintessence?

Abstract Multifield models with a curved field space have already been shown to be able to provide viable quintessence models for steep potentials that satisfy swampland bounds. The simplest

Clustering dark energy imprints on cosmological observables of the gravitational field

We study cosmological observables on the past light-cone of a fixed observer in the context of clustering dark energy. We focus on observables that probe the gravitational field directly, namely

Non-canonical kinetic structures in the swampland

We consider how the swampland criteria might be applied to models in which scalar fields have nontrivial kinetic terms, particularly in the context of P(ϕ,X) theories, popularly used in approaches to

New accelerating solutions in late-time cosmology

Dark energy models can be seen as dynamical systems. In this paper we show that multi-field models with a curved field space give rise to new critical points and we analyse their stability. These are

Dynamics of dark energy

We review in detail a number of approaches that have been adopted to try and explain the remarkable observation of our accelerating universe. In particular we discuss the arguments for and recent

De Sitter vacua in string theory

We outline the construction of metastable de Sitter vacua of type IIB string theory. Our starting point is highly warped IIB compactifications with nontrivial NS and RR three-form fluxes. By

Probing dark energy perturbations: The dark energy equation of state and speed of sound as measured by WMAP

We review the implications of having a nontrivial matter component in the Universe and the potential for detecting such a component through the matter power spectrum and integrated Sachs-Wolfe

Hyperbolic Inflation.

A model of cosmological inflation is proposed in which field space is a hyperbolic plane. The inflaton never slow-rolls, and instead orbits the bottom of the potential, buoyed by a centrifugal force.