Friedmann cosmology with fluids and hyperfluids
Ilaria Andrei, Damianos Iosifidis, Laur J\"arv, Margus Saal
TL;DR
This paper explores flat FLRW cosmology within metric-affine gravity, focusing on fluids with hypermomentum, and suggests a dark dust fluid with spin hypermomentum could have a dynamic equation of state related to observational data.
Contribution
It introduces a cosmological model with hyperfluid matter components, highlighting the role of spin hypermomentum in dynamical equations of state and potential observational relevance.
Findings
Dark dust fluid with spin hypermomentum can have a dynamical equation of state.
The model may relate to DESI DR2 observational data.
Hyperfluid components influence cosmological evolution in metric-affine gravity.
Abstract
We discuss flat Friedmann-Lemaitre-Robertson-Walker (FLRW) metric-affine cosmology where the metric and connection as well as the matter energy-momentum and hypermomentum all obey the symmetry of spatial homogeneity and isotropy. In particular, we outline a scenario where a dark dust fluid carries spin hypermomentum which makes its effective equation of state dynamical and might relate to the DESI DR2 data.
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