Standardizing Dainotti-correlated gamma-ray bursts, and using them with standardized Amati-correlated gamma-ray bursts to constrain cosmological model parameters

TL;DR

This study demonstrates that certain gamma-ray burst datasets obey model-independent correlations, allowing their use as standard candles to place constraints on cosmological parameters, complementing existing data.

Contribution

It introduces a method to standardize Dainotti-correlated GRBs and combines them with Amati-correlated GRBs to constrain cosmological models.

Findings

GRB datasets obey model-independent correlations

Constraints on matter density and curvature are obtained

Results are consistent with accelerated expansion

Abstract

We show that each of the three Dainotti-correlated gamma-ray burst (GRB) data sets recently compiled by Wang et al. and Hu et al., that together probe the redshift range $0.35 \leq z \leq 5.91$, obey cosmological-model-independent Dainotti correlation relations and so are standardizable. We use these GRB data in conjunction with the best currently-available Amati-correlated GRB data, that probe $0.3399 \leq z \leq 8.2$, to constrain cosmological model parameters. The resulting cosmological constraints are weak, providing lower limits on the non-relativistic matter density parameter, mildly favoring non-zero spatial curvature, and largely consistent with currently accelerated cosmological expansion as well as with constraints determined from better-established data.