Friedmann cosmology with fluids and hyperfluids
arXiv:2604.03343 · doi:10.1088/1742-6596/3177/1/012033
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.
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