paper

Intermediate redshift calibration of Gamma-ray Bursts and cosmic constraints in non-flat cosmology

arXiv:2207.00440 · doi:10.1093/mnras/stac2925

Abstract

We propose how to calibrate long gamma-ray burst (GRB) correlations employing intermediate redshift data sets, instead of limiting to catalogs. To do so, we examine the most updated observational Hubble data (OHD) and baryonic acoustic oscillations (BAO). We exploit the model-independent technique of Bézier polynomial interpolation, alleviating de facto the well-known circularity problem affecting GRB correlations. To get constraints on cosmic parameters, using Markov chain Monte Carlo Metropolis algorithm, we distinguish the influence on BAO scale, , Hubble constant , luminosity distance and spatial curvature . Inspired by the fact that a few 0.4 error on is got from Planck results, utterly small compared with current BAO measurement errors, we discern two main cases, namely and . For each occurrence, we first fix and then leave free the Universe's spatial curvature. In all our treatments, we make use of the well-consolidated \textit{Amati} correlation, furnishing tighter constraints on the mass density than previous literature. In particular, our findings turn out to be highly more compatible with those got, adopting the CDM paradigm, with standard candle indicators. Finally, we critically re-examine the recent tension in view of our outcomes.

8 pages, 4 figures, 3 tables

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