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arXiv · 2402.18967

Cosmological transition epoch from gamma-ray burst correlations

Anna Chiara Alfano·Salvatore Capozziello·Orlando Luongo·Marco Muccino
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Abstract

The redshift $z_t$ and the jerk parameter $j_t$ of the transition epoch are constrained by using two model-independent approaches involving the direct expansion of the Hubble rate and the expansion of the deceleration parameter around $z=z_t$. To extend our analysis to high-redshifts, we employ the \emph{Amati}, \emph{Combo}, \emph{Yonetoku} and \emph{Dainotti} gamma-ray burst correlations. The \textit{circularity problem} is prevented by calibrating these correlations through the B\'ezier interpolation of the updated observational Hubble data. Each gamma-ray burst data set is jointly fit with type Ia supernovae and baryonic acoustic oscillations through a Monte Carlo analysis, based on the Metropolis-Hastings algorithm, to obtain $z_t$, $j_t$ and the correlation parameters. The overall results are compatible with the concordance model with some exceptions. We also focus on the behaviors of the dark energy, verifying its compatibility with a cosmological constant, and the matter density $\Omega_m$ and compare them with the expectations of the concordance paradigm.

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Anna Chiara Alfano, Salvatore Capozziello, Orlando Luongo, Marco Muccino. 2024-02-29. Cosmological transition epoch from gamma-ray burst correlations. https://arxiv.org/abs/2402.18967

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