We study black holes in the modified generalized Chaplygin gas (MGCG) model, a modified gravity framework proposed to unify dark matter and dark energy. The resulting spacetime is asymptotically nonflat and features two distinct horizons, determined by the Chaplygin parameter $\alpha$. Observational constraints favor negative values of $\alpha$, which restrict the allowed parameter space. Through linear perturbation analysis, we show that this black hole remains stable under both scalar and electromagnetic perturbation. The corresponding quasinormal mode spectra depend sensitively on the MGCG parameters, indicating that this cosmological model leaves characteristic imprints on black hole oscillations. These results suggest that gravitational-wave observations of black hole ringdowns may provide a means of constraining MGCG and testing unified dark sector scenarios in the strong-field regime.

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• Alternative gravity theories
• General relativity
• Gravitation
• Gravitational waves