Comparison of HMG and flat rotation velocities inferred from galaxy-galaxy weak lensing

TL;DR

This study compares Hyperconical Modified Gravity (HMG) with flat rotation velocities from galaxy-galaxy weak lensing, finding HMG better reproduces flat velocity curves than MOND, supporting its viability as an alternative gravity theory.

Contribution

The paper introduces HMG as a promising alternative to MOND, successfully explaining galactic rotation curves without dark matter using weak lensing data.

Findings

HMG reproduces flat velocity curves slightly better than MOND.

HMG interprets galactic anomalies as effects of cosmic expansion.

Supports HMG as a viable alternative gravity model.

Abstract

Despite the success of dark-matter models, unresolved issues require exploring alternatives such as modified gravity theories. In this context, we examine the compatibility of the Hyperconical Modified Gravity (HMG) with galaxy rotation curves inferred from weak-lensing data. The research addresses the existing limitations of Modified Newtonian Dynamics (MOND), which often struggle with universal applicability across different galactic scales. By assuming local validity of General Relativity (GR) and analyzing recent data on circular velocities from galaxy-galaxy weak lensing, our findings interpret the galactic dynamics anomaly as a fictitious acceleration inherited from the cosmic expansion, without invoking dark matter. The results indicate that HMG successfully reproduces flat velocity curves on scales of 1 Mpc slightly better than MOND. Therefore, these observations support HMG as a viable gravitational model, highlighting its potential to account for dynamics on galaxies and other scales. Further research with extensive datasets is required to confirm these preliminary insights.