Gravitational Instability of Cold Axion Dark Matter Beyond Minimal Coupling

Following recent observations of unexpectedly massive galaxies at high redshift by the James Webb Space Telescope, the revision of Dark Matter (DM) models --specifically regarding how DM couples to gravity-- has become a central topic in Cosmology. In this paper, we develop an axion model for Cold Dark Matter (CDM) with a non-minimal coupling to gravity. From this framework, we evaluate the gravitational instability in the hydrodynamic limit. Our results demonstrate how gravitational instabilities depend on the non-minimal coupling parameter, providing a novel tool for aligning with the high-redshift observations from the James Webb Space Telescope.

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Authors

Bryan Cordero-Patino; Álvaro Duenas-Vidal; Jorge Segovia

Published

Oct 19, 2026

Paper type

preprint

Source

Arxiv