A generalized Chaplygin gas with redshift-dependent exponent unifies the dark sector but is statistically equivalent to ΛCDM after penalizing for extra parameters in Bayesian fits to late-time data.
The LambertWequation of state in light of DESI BAO,
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Unifying the Dark Sector with the New Generalized Chaplygin Gas: Observational Constraints
A generalized Chaplygin gas with redshift-dependent exponent unifies the dark sector but is statistically equivalent to ΛCDM after penalizing for extra parameters in Bayesian fits to late-time data.