In metric-affine gravity with hyperfluids of constant equation of state, Friedmann evolution is modified by hypermomentum and depends on the constants linking hypermomentum to matter density.
Isotropic cosmology in metric-affine gauge theory of gravity
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abstract
Geometrical structure of homogeneous isotropic models in the frame of the metric-affine gauge theory of gravity (MAGT) is analyzed. By using general form of gravitational Lagrangian including both a scalar curvature and various invariants quadratic in the curvature, torsion and nonmetricity tensors, gravitational equations of MAGT for homogeneous isotropic models are deduced. It is shown, that obtained gravitational equations lead to generalized cosmological Friedmann equation for the metrics by certain restrictions on indefinite parameters of gravitational Lagrangian. Isotropic models in the Weyl-cartan space-time are discussed.
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Friedmann cosmology with hyperfluids of constant equation of state
In metric-affine gravity with hyperfluids of constant equation of state, Friedmann evolution is modified by hypermomentum and depends on the constants linking hypermomentum to matter density.