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Journal Paper

전체
Generalized emergent dark energy model and the Hubble constant tension
  • 2021-09-09
  • PHYSICAL REVIEW D 104 6 : 063521-1~063521-11
We investigate a generalized form of the phenomenologically emergent dark energy model, known as generalized emergent dark energy (GEDE), introduced by Li and Shafieloo [Astrophys. J. 902, 58 (2020)] in light of a series of cosmological probes and considering the evolution of the model at the level of linear perturbations. This model introduces a free parameter Δ that can discriminate between the ΛCDM (corresponds to Δ ¼ 0) or the phenomenologically emergent dark energy (PEDE) (corresponds to Δ ¼ 1) models, allowing us to determine which model is preferred most by the fit of the observational datasets. We find evidence in favor of the GEDE model for Planck alone and in combination with R19, while the Bayesian model comparison is inconclusive when supernovae type Ia or baryon acoustic oscillation (BAO) data are included. In particular, we find that the ΛCDM model is disfavored at more than 2σ C.L. for most of the observational datasets considered in this work and PEDE is in agreement with Planck 2018 þBAO þ R19 combination within 1σ C.L.