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Interacting vacuum models and cosmological tensions

Published on:

21 December 2023

Primary Category:

Cosmology and Nongalactic Astrophysics

Paper Authors:

Marco Sebastianutti,

Natalie B. Hogg,

Marco Bruni


Key Details

First derivation of covariant gauge-invariant perturbations for interacting vacuum

Study evolution of H0 and σ8 in 3 interacting vacuum models

Identify if regions of parameter space resolve tensions simultaneously

When constrained by data, no model fully resolves both tensions

AI generated summary

Interacting vacuum models and cosmological tensions

This paper analyzes three interacting vacuum dark energy models to see if they can simultaneously resolve the Hubble constant (H0) and matter clustering (σ8) tensions. The authors derive the first covariant gauge-invariant perturbation formalism for interacting vacuum models. For models with geodesic cold dark matter, they connect perturbation variables to cosmological observables like H0 and σ8. Models studied: (1) linear coupling between vacuum & matter; (2) coupling mimicking a Chaplygin gas; (3) coupling mimicking a Shan-Chen fluid. No model fully resolves both tensions simultaneously when constrained by data.

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