Astrophysics

Motion of Bodies in an Energy Medium: A New Model of Gravity, Orbital Precession, and Cosmological Phenomena

Authors: Viktor Strohm
Comments: 5 Pages. (Note by viXra Admin: Please cite scientific references of other authors)

A mechanical model of gravity is proposed within the framework of an energy medium, in which every body continuously absorbs energy, creating a sphere of reduced energy density around itself. The pressure gradient of this medium generates a force that exactly reproduces Newton’s law for an appropriate choice of coefficient. The model naturally explains capture into elliptical orbits, perihelion precession (through violation of additivity of density in the region of overlapping spheres — "synergy"), and provides a physical interpretation of gravitational redshift/blueshift, cosmological redshift, the Hubble constant, and the negative result of the Michelson—Morley experiment. Analytical and numerical formulas for calculating trajectories, including precessing rosettes, have been obtained.
Category: Astrophysics

Galactic Rotation Curves from Full-Disk Newtonian Modeling: The Lost and Found Framework

Authors: Adolfo Santa Fe Dueñas
Comments: 15 Pages. Also available on arXiv:2604.06917

The approximately flat outer parts of spiral galaxy rotation curves are commonly interpreted as evidence for a discrepancy between the observed baryonic mass and the dynamical mass inferred from the measured orbital velocities. In many analyses, simplified mass estimates are often expressed through the Keplerian relation v²(R) = GM(<R)/R, which is exact only under spherical symmetry. Spiral galaxies, however, are flattened disk systems, for which mass exterior to the galactocentric radius under consideration can contribute non-negligibly to the gravitational field.

Previous thin-disk studies have shown that the gravitational field in disk galaxies can be computed from the full mass distribution rather than from enclosed-mass approximations alone. Building on this approach, we introduce the Lost and Found (LF) framework, a geometrically consistent Newtonian model based on direct full-disk gravitational integration and a parametrized representation of the disk surface density.

We apply the LF model to a heterogeneous sample of disk galaxies spanning a broad range of masses and radial extents. The model reproduces the main observed features of the rotation curves, including the inner rise and the approximately flat outer behavior, while yielding systematically lower inferred masses compared to standard Keplerian estimates. Across the sample, the LF-inferred mass scales nearly linearly with the conventional dynamical mass, with a characteristic scaling factor η_LF ∼ 0.67.

These results suggest that part of the inferred mass discrepancy in disk galaxies may be associated with geometric assumptions in standard mass estimates, and highlight the importance of full-disk treatments when interpreting galactic rotation curves.