Cosmology with Type II supernovae

摘要

With the recent progresses on the Type II supernovae, we attempt to investigate whether there does exist new physics beyond the standard cosmological paradigm, i.e. the cosmological constant Lambda plus cold dark matter (Lambda CDM). Constraining four alternative cosmological models with a data combination of currently available Type II supernovae calibrated by the standard color method, Type Ia supernovae, baryon acoustic oscillations (BAO), cosmic microwave background (CMB) and cosmic chronometers, at the 1 sigma confidence level, we find that (i) a spatially flat universe is supported for the nonflat Lambda CDM model; (ii) the constrained equation-of-state of dark energy omega is consistent with the Lambda CDM hypothesis for the omega CDM model, where omega is a free parameter; (iii) for the decaying vacuum model, there is no evidence of interaction between dark matter and dark energy in the dark sector of the universe; (iv) there is also no hint of dynamical dark energy for the dark energy density-parametrization scenario. It is very obvious that a larger Type II supernovae sample is required if we expect to draw definitive conclusions about the formation and evolution of the universe.