Cosmological dynamics of multifield dark energy. (arXiv:2201.08841v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Eskilt_J/0/1/0/all/0/1">Johannes R. Eskilt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Akrami_Y/0/1/0/all/0/1">Yashar Akrami</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Solomon_A/0/1/0/all/0/1">Adam R. Solomon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vardanyan_V/0/1/0/all/0/1">Valeri Vardanyan</a>
We numerically and analytically explore the background cosmological dynamics
of multifield dark energy with highly non-geodesic 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.
We numerically and analytically explore the background cosmological dynamics
of multifield dark energy with highly non-geodesic 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.
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