Constraints on Cosmological Parameters with a Sample of Type Ia Supernovae from JWST

TL;DR

This study explores how very high-redshift Type Ia supernovae observed by JWST can improve constraints on cosmological parameters and help disentangle systematic effects related to luminosity distance evolution.

Contribution

It demonstrates that VHZ SNe~Ia can accurately determine systematic evolution coefficients, improving cosmological measurements by separating evolution effects from cosmological models.

Findings

VHZ SNe~Ia can distinguish systematic luminosity evolution up to 0.15-0.45 mag.

Coefficients of evolution formulas can be accurately measured and decoupled from cosmology.

Combining VHZ SNe~Ia with lower-redshift surveys refines the universe's expansion history.

Abstract

We investigate the potential of using a sample of very high-redshift ($2\lesssim z \lesssim6$) (VHZ) Type Ia supernovae (SNe~Ia) attainable by the James Webb Space Telescope (JWST) on constraining cosmological parameters. At such high redshifts, the age of the universe is young enough that the VHZ SNIa sample comprises the very first SNe~Ia of the universe, with progenitors among the very first generation of low mass stars that the universe has made. We show that the VHZ SNe~Ia can be used to disentangle systematic effects due to the luminosity distance evolution with redshifts intrinsic to SNIa standardization. Assuming that the systematic evolution can be described by a linear or logarithmic formula, we found that the coefficients of this dependence can be determined accurately and decoupled from cosmological models. Systematic evolution as large as 0.15 mag and 0.45 mag out to $z=5$ can be robustly separated from popular cosmological models for the linear and logarithmic evolution, respectively. The VHZ SNe~Ia will lay the foundation for quantifying the systematic redshift evolution of SNIa luminosity distance scales. When combined with SNIa surveys at comparatively lower redshifts, the VHZ SNe~Ia allow for a precise measurement of the history of the expansion of the universe from $z\sim 0$ to the epoch approaching reionization.