paper

Measuring cosmological parameters with a luminosity-time correlation of gamma-ray bursts

arXiv:2107.12718 · doi:10.1093/mnras/stab2180

Abstract

Gamma-ray bursts (GRBs), as a possible probe to extend the Hubble diagram to high redshifts, have attracted much attention recently. In this paper, we select two samples of GRBs that have a plateau phase in X-ray afterglow. One is short GRBs with plateau phases dominated by magnetic dipole (MD) radiations. The other is long GRBs with gravitational-wave (GW) dominated plateau phases. These GRBs can be well standardized using the correlation between the plateau luminosity and the end time of plateau . The so-called circularity problem is mitigated by using the observational Hubble parameter data and Gaussian process method. The calibrated \ltb ~correlations are also used to constrain CDM and = models. Combining the MD-LGRBs sample from Wang et al. (2021) and the MD-SGRBs sample, we find and = excluding systematic uncertainties in the nonflat CDM model. Adding type Ia supernovae from Pantheon sample, the best-fitting results are = and = in the model. These results are in agreement with the CDM model. Our result supports that selection of GRBs from the same physical mechanism is crucial for cosmological purposes.

18 pages, 12 figures, 1 table, accepted for publication in MNRAS

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