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arXiv · 2511.03839

On the Evidence for Violation of the Equivalence Principle in Disk Galaxies

Corey Sargent·William Clark·Antonia Seifert·Alicia Mand·Emerson Rogers·Adam Lane·Alexandre Deur·Balša Terzić
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Abstract

We examine the claimed observations of a gravitational external field effect (EFE) reported in Chae et al. We show that observations suggestive of the EFE can be interpreted without violating Einstein's equivalence principle, namely from known correlations between morphology, environment and dynamics of galaxies. While Chae et al's analysis provides a valuable attempt at a clear test of Modified Newtonian Dynamics, an evidently important topic, a re-analysis of the observational data does not permit us to confidently assess the presence of an EFE or to distinguish this interpretation from that proposed in this article.

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Corey Sargent, William Clark, Antonia Seifert, Alicia Mand, Emerson Rogers, Adam Lane, Alexandre Deur, Balša Terzić. 2025-11-05. On the Evidence for Violation of the Equivalence Principle in Disk Galaxies. https://doi.org/10.3390/particles8030065

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