The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 44 Issue 2
- /
- Pages.54.1-54.1
- /
- 2019
- /
- 1226-2692(pISSN)
Model-independent constraints on the light-curve parameters and reconstructions of the expansion history from Type Ia supernovae
- Koo, Hanwool (Korea Astronomy and Space Science Institute) ;
- Shafieloo, Arman (Korea Astronomy and Space Science Institute) ;
- Keeley, Ryan (Korea Astronomy and Space Science Institute) ;
- L'Huillier, Benjamin (Yonsei University)
- 구한울 (한국천문연구원) ;
- ;
- ;
- Published : 2019.10.14
Abstract
We use iterative smoothing reconstruction method along with exploring in the parameter space of the light curves of the JLA supernova compilation (Joint Light-curve Analysis) to simultaneously reconstruct the expansion history of the universe as well as putting constrains on the light curve parameters without assuming any cosmological model. Our constraints on the light curve parameters of the JLA from our model-independent analysis seems to be closely in agreement with results assuming ΛCDM cosmology or using Chevallier-Polarski-Linder (CPL) parametrization for the equation of state of dark energy. This implies that there is no hidden significant feature in the data that could be neglected by cosmology model assumption. The reconstructed expansion history of the universe and properties of dark energy seems to be in good agreement with expectations of the standard ΛCDM model. Our results also indicate that the data allows a considerable flexibility for expansion history of the universe.
Keywords