Modified emergent dark energy and its astronomical constraints
H. Benaoum, Weiqiang Yang, Supriya Pan, Eleonora Di Valentino
Abstract
In this paper, we generalize the Phenomenologically Emergent Dark Energy (PEDE) model, famous for solving the long standing Hubble tension, with our Modified Emergent Dark Energy (MEDE) scenario. This new model introduces one additional parameter ‘[Formula: see text]’ that, depending on the value assumed by the analysis, can recover [Formula: see text]CDM (if [Formula: see text]), PEDE (if [Formula: see text]). We perform a robust observational analysis of MEDE using various observational datasets including cosmic microwave background (CMB) radiation, baryon acoustic oscillations (BAO) distance measurements, a local value of the Hubble constant (R19) and the Pantheon sample of Supernovae Type Ia. We find that when [Formula: see text] is free to vary, the [Formula: see text] tension is alleviated but not solved like in PEDE, and the [Formula: see text]CDM is always preferred by the data when R19 is excluded, as confirmed by the bayesian evidence analysis.