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2024

A novel approach to cosmological non-linearities as an effective fluid

Giani, Leonardo, Von Marttens, Rodrigo, Camilleri, Ryan

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We propose a two parameters extension of the flat $\Lambda$CDM model to capture the impact of matter inhomogeneities on our cosmological inference.

Non virialized but non-linearly evolving overdense and underdense regions, whose abundance is quantified using the Press-Schechter formalism, are collectively described by two effective perfect fluids $\rho_{\rm{c}},\rho_{\rm{v}}$ with non vanishing equation of state parameters $w_{\rm{c,v}}\neq 0$.
These fluids are coupled to the pressureless dust, akin to an interacting DM-DE scenario.
The resulting phenomenology is very rich, and could potentially address a number of inconsistencies of the standard model, including a simultaneous resolution of the Hubble and $\sigma_8$ tensions.

A novel approach to cosmological non-linearities as an effective fluid · Around

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