This publication is a supplementary note to Relativistic Coherent Vacuum Gravity Theory (rCVGT) v.2.2. It provides a focused and self-contained clarification of how dark-matter-like gravitational phenomena emerge within the rCVGT framework without introducing particle dark matter. The note explains how spatial variations in the vacuum coherence field give rise to an effective coherent vacuum density that enters the gravitational field equations. In the weak-field regime, this density appears as an additional source term in the Poisson equation and reproduces key observational features commonly attributed to dark matter, including flat galactic rotation curves, gravitational lensing, and cluster-scale mass distributions. A worked observational example based on the spiral galaxy NGC 3198 is included, demonstrating explicitly how an observed rotation curve maps to an effective coherent vacuum density and halo mass profile within rCVGT. This document is intended to complement the main rCVGT paper by clarifying physical mechanisms and observational interpretation, rather than presenting new fundamental theory or a full numerical data analysis.
Steen Møller Nielsen (Fri,) studied this question.