Astrophysics

    

The Role of the Hubble Parameter in Galactic Rotation Curves and Spiral Morphology

Authors: E. P. J. de Haas

We investigate the influence of the Hubble parameter H(z) on galactic dynamics and morphology. By introducing the cosmic expansion as an effective limit on Newtonian gravitation, we obtain a redshift-dependent critical radius that constrains both spiral structure and rotation curves. Galactic bars are interpreted as frozen spirals of high-z epochs nested inside extended low-z spirals. This framework naturally explains the coexistence of bulges, bars, disks and halos as the outcome of metric inflow and bulge reset events. The resulting morphology and kinematics provide a direct and testable connection between galactic structure and the cosmic expansion. We argue that this approach opens a new possibility to empirically derive H(z)from galaxy morphology and rotation curves and allows reconstructing the expansion history of the universe on galactic scales.

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[v1] 2025-09-21 21:04:00

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