Cosmological constraints from calibrated Ep - E iso gamma-ray burst correlation by using DESI 2024 data release
Alfano A.C. Luongo O. Muccino M.
1 December 2024Institute of Physics
Journal of Cosmology and Astroparticle Physics
2024#2024Issue 12
Recent outcomes by the DESI Collaboration have shed light on a possible slightly evolving dark energy, challenging the standard ΛCDM paradigm. To better understand dark energy nature, high-redshift observations like gamma-ray burst data become essential for mapping the universe expansion history, provided they are calibrated with other probes. To this aim, we calibrate the Ep - E iso (or Amati) correlation through model-independent Bézier interpolations of the updated Hubble rate and the novel DESI data sets. More precisely, we provide two Bézier calibrations: i) handling the entire DESI sample, and ii) excluding the point at z eff = 0.51, criticized by the recent literature. In both the two options, we let the comoving sound horizon at the drag epoch, rd , vary in the range rd ∈ [138, 156] Mpc. The Planck value is also explored for comparison. By means of the so-calibrated gamma-ray bursts, we thus constrain three dark energy frameworks, namely the standard ΛCDM, the ω 0CDM and the ω 0 ω 1CDM models, in both spatially flat and non-flat universes. To do so, we worked out Monte Carlo Markov chain analyses, making use of the Metropolis-Hastings algorithm. Further, we adopt model selection criteria to check the statistically preferred cosmological model finding a preference towards the concordance paradigm with a zero curvature parameter. Nonetheless, the criteria also show a weak preference towards the non-flat ΛCDM and the flat ω 0CDM scenario, leaving open to the possibility of such models as alternatives to the flat concordance paradigm. Finally, we compared the constraints got from the prompt emission Ep - E iso correlation with those from the prompt-afterglow emission LX - TX - Lp correlation.
dark energy theory , gamma ray bursts theory
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Scuola Superiore Meridionale, Largo S. Marcellino 10, Napoli, 80138, Italy
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Napoli, Complesso Universitario Monte S. Angelo, Via Cinthia 9 Edificio G, Napoli, 80138, Italy
Università di Camerino, Divisione di Fisica, Via Madonna delle carceri 9, Camerino, 62032, Italy
SUNY Polytechnic Institute, Utica, 13502, NY, United States
INFN, Sezione di Perugia, Perugia, 06123, Italy
INAF — Osservatorio Astronomico di Brera, Milano, Italy
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
ICRANet, Piazza della Repubblica 10, Pescara, 65122, Italy
Scuola Superiore Meridionale
Istituto Nazionale di Fisica Nucleare (INFN)
Università di Camerino
SUNY Polytechnic Institute
INFN
INAF — Osservatorio Astronomico di Brera
Al-Farabi Kazakh National University
ICRANet
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