Model-independent estimation of the cosmography parameters using cosmic chronometers

Abstract

Measurement of the universe expansion rate through the cosmic chronometers proves to be a novel approach to understanding cosmic history. Although it provides a direct determination of the Hubble parameters at different redshifts, it suffers from underlying systematic uncertainties. In this work, we analyze the recent cosmic chronometer data with and without systematic uncertainties and investigate how they affect the results. We perform our analysis in both model-dependent and independent methods to avoid any possible model bias. In the model-dependent approach, we consider the $\Lambda$CDM, wCDM and CPL models. On the Other hand, since the Gaussian process provides a unique tool to study data including a non-diagonal covariance matrix, our model-independent analysis is based on the Gaussian process.

Published in EPJCP

References in corpus (15)

• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• The Physics of Gamma-Ray Bursts and Relativistic Jets
• Hubble parameter measurement constraints on the redshift of the deceleration-acceleration transition, dynamical dark energy, and space curvature
• Gaussian Process Cosmography
• Eppur è piatto? The cosmic chronometer take on spatial curvature and cosmic concordance
• Cosmology with gamma-ray bursts: I. The Hubble diagram through the calibrated $E_{\mathrm{p},\mathrm{i}}$ - $E_{\mathrm{iso}}$ correlation
• Dipole of the luminosity distance: a direct measure of H(z)
• COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408-5354 with high-cadence photometric monitoring
• Model Independent Reconstruction of the Expansion History of the Universe and the Properties of Dark Energy
• Cosmology with gamma-ray bursts: II Cosmography challenges and cosmological scenarios for the accelerated Universe
• Searching for signals of inhomogeneity using multiple probes of the cosmic expansion rate H(z)
• Model-independent constraints on ${\Omega }_m$ and $H(z)$ from the link between geometry and growth
• Using newest VLT-KMOS HII Galaxies and other cosmic tracers to test the $\Lambda$CDM tension

Cited by in corpus (7)

• Constraining minimally extended varying speed of light by cosmological chronometers
• Cosmography from well-localized Fast Radio Bursts
• Joint Constraints on the Hubble Constant, Spatial Curvature, and Sound Horizon from the Late-time Universe with Cosmography
• Reconstructing the growth index $\gamma$ with Gaussian Processes
• Review on the minimally extended varying speed of light model
• Cosmological parameter constraints using phenomenological symbolic expressions: On the significance of symbolic expression complexity and accuracy
• EFT of Dark Energy with Cosmic Chronometers: Reconstructing Background EFT Functions