English

Determining Cosmological-model-independent $H_0$ with Gravitationally Lensed Supernova Refsdal

Cosmology and Nongalactic Astrophysics 2024-05-07 v2

Abstract

{{The reappearance of supernova Refsdal with detailed modeling of the lens cluster allows us to measure the time-delay distance,}} which serves as a powerful tool to determine the Hubble constant (H0H_0). We give a cosmological-model-independent method to estimate H0H_0 through Gaussian process regression, using time-delay measurements from this lensed supernova in combination with supernova data from the Pantheon+ sample. {{Using eight mass models for the lens cluster,}} we infer H0=64.24.3+4.4kms1Mpc1H_0 = 64.2^{+4.4}_{-4.3} \, \rm{km\,s^{-1}\,Mpc^{-1}} and using two cluster models most consistent with the observations, we infer H0=66.33.6+3.8kms1Mpc1H_0 = 66.3^{+3.8}_{-3.6} \, \rm{km\,s^{-1}\,Mpc^{-1}}. Our estimates of the value of H0H_0 are in 1σ1\sigma agreement with the results assuming a flat Λ\LambdaCDM model and the uncertainties are comparable. Our constraint results on H0H_0 from the eight lens models and the two lens models indicate 2σ2\sigma and 1.8σ1.8\sigma tensions with that estimated by Supernova H0 for the Equation of State, respectively. However, our median values of H0H_0 from the two sets of lens models show good consistency with H0H_0 inferred from Planck cosmic microwave background observations assuming Λ\LambdaCDM model within 1σ1\sigma. We also find that our results for H0H_0 indicate 2σ2\sigma deviations and 1.7σ1.7\sigma deviations from the constraint results of H0H_0 using six time-delay quasars by H0LiCOW with the same analysis method.

Keywords

Cite

@article{arxiv.2401.12052,
  title  = {Determining Cosmological-model-independent $H_0$ with Gravitationally Lensed Supernova Refsdal},
  author = {Xiaolei Li and Kai Liao},
  journal= {arXiv preprint arXiv:2401.12052},
  year   = {2024}
}

Comments

6 pages, 2 figures