Horndeski in motion
J. Bayron Orjuela-Quintana, Jose Beltr\'an Jim\'enez

TL;DR
This paper explores anisotropic cosmologies within shift-symmetric Horndeski theories, focusing on their role as moving dark energy models and their observable effects on large-scale cosmic flows and CMB anisotropies.
Contribution
It introduces a class of axisymmetric Bianchi I cosmologies with inhomogeneous scalar fields in shift-symmetric Horndeski theories, linking them to moving dark energy scenarios.
Findings
Universal evolution of momentum density in these models
Realisation of moving dark energy with non-trivial effects
Implications for large-scale dark flows and CMB anisotropies
Abstract
We study a class of homogeneous but anisotropic cosmologies within the family of shift-symmetric Horndeski theories, where the scalar field features an inhomogeneous profile but it preserves a translational symmetry that is realised as a combination of spatial translations and internal shifts. The spatial gradient of the scalar field introduces a preferred direction, so the resulting cosmologies are of the axisymmetric Bianchi I type. The momentum density of these configurations exhibits a universal evolution and an additional component with non-vanishing momentum density is required to have non-trivial effects. We show the relation of these scenarios with cosmologies of non-comoving components and, in particular, we explain how they provide a specific realisation of moving dark energy models. Among the class of shift-symmetric Horndeski theories, we analyse in more detail the case of…
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Taxonomy
TopicsCosmology and Gravitation Theories · Galaxies: Formation, Evolution, Phenomena · Dark Matter and Cosmic Phenomena
