Friedmann cosmology with fluids and hyperfluids
General Relativity and Quantum Cosmology
2026-04-07 v1 Cosmology and Nongalactic Astrophysics
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.
Cite
@article{arxiv.2604.03343,
title = {Friedmann cosmology with fluids and hyperfluids},
author = {Ilaria Andrei and Damianos Iosifidis and Laur Järv and Margus Saal},
journal= {arXiv preprint arXiv:2604.03343},
year = {2026}
}
Comments
Contributed to The 24th International Conference on General Relativity and Gravitation (GR24) and the 16th Edoardo Amaldi Conference on Gravitational Waves (Amaldi16) 14/07/2025 - 18/07/2025 Glasgow, United Kingdom; 4 pages, 1 figure