Comprehensive cosmographic analysis by Markov Chain Method

Abstract

We study the possibility to extract model independent information about the dynamics of the universe by using Cosmography. We intend to explore it systematically, to learn about its limitations and its real possibilities. Here we are sticking to the series expansion approach on which Cosmography is based. We apply it to different data sets: Supernovae Type Ia (SNeIa), Hubble parameter extracted from differential galaxy ages, Gamma Ray Bursts (GRBs) and the Baryon Acoustic Oscillations (BAO) data. We go beyond past results in the literature extending the series expansion up to the fourth order in the scale factor, which implies the analysis of the deceleration, q_{0}, the jerk, j_{0} and the snap, s_{0}. We use the Markov Chain Monte Carlo Method (MCMC) to analyze the data statistically. We also try to relate direct results from Cosmography to dark energy (DE) dynamical models parameterized by the Chevalier-Polarski-Linder (CPL) model, extracting clues about the matter content and the dark energy parameters. The main results are: a) even if relying on a mathematical approximate assumption such as the scale factor series expansion in terms of time, cosmography can be extremely useful in assessing dynamical properties of the Universe; b) the deceleration parameter clearly confirms the present acceleration phase; c) the MCMC method can help giving narrower constraints in parameter estimation, in particular for higher order cosmographic parameters (the jerk and the snap), with respect to the literature; d) both the estimation of the jerk and the DE parameters, reflect the possibility of a deviation from the LCDM cosmological model.

24 pages, 7 figures

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• Observational constraints on cosmological solutions of $f(Q)$ theories
• Precision cosmology with Padé rational approximations: theoretical predictions versus observational limits
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• Cosmography approach to dark energy cosmologies: new constrains using the Hubble diagrams of supernovae, quasars and gamma-ray bursts
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• A cosmographic analysis of the transition to acceleration using SN-Ia and BAO
• Flat FLRW Universe in logarithmic symmetric teleparallel gravity with observational constraints
• Scrutinizing Various Phenomenological Interactions In The Context Of Holographic Ricci Dark Energy Models
• Running vacuum versus Holographic dark energy: a cosmographic comparison
• Neural networks and standard cosmography with newly calibrated high redshift GRB observations
• Future dynamics in f(R) theories
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• Model-independent cosmological inference after the DESI DR2 data with improved inverse distance ladder
• f(T) cosmology against the cosmographic method: A new study using mock and observational data
• Diagnostic and Comparative Analysis of Dark Energy Models with $q(z)$ Parametrizations
• Recovering $\Lambda$CDM Model From a Cosmographic Study
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• Constraining f(R) theories with cosmography
• Curvature dark energy reconstruction through different cosmographic distance definitions
• Potentialities of Hubble parameter and expansion rate function data to alleviate Hubble tension
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• A four-dimensional ΛCDM-type cosmological model induced from higher dimensions using a kinematical constraint
• Cosmography and the redshift drift in Palatini $f(\mathcal{R})$ theories
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• Perturbations In Some Dark Energy Models