Simultaneous measurements on cosmic curvature and opacity using latest HII regions and $H(z)$ observations

Abstract

The different spatial curvatures of the universe affect the measurement of cosmological distances, which may also contribute to explaining the observed dimming of type Ia supernovae. This phenomenon may be caused by the opacity of the universe. Similarly, the opacity of the universe can lead to a bias in our measurements of curvature. Thus, it is necessary to measure cosmic curvature and opacity simultaneously. In this paper, we propose a new model-independent method to simultaneously measure the cosmic curvature and opacity by using the latest observations of HII galaxies acting as standard candles and the latest Hubble parameter observations. The machine learning method-Artificial Neural Network is adopted to reconstruct observed Hubble parameter $H(z)$ observations. Our results support a slightly opaque and flat universe at $1\sigma$ confidence level by using previous 156 HII regions sample. However, the negative curvature is obtained by using the latest 181 HII regions sample in the redshift range $z\sim 2.5$. More importantly, we obtain the simultaneous measurements with precision on the cosmic opacity $\mathrm{\Delta }\tau \sim 10^{-2}$ and curvature $\mathrm{\Delta }{\mathrm{\Omega }}_{\mathrm{K}}\sim 10^{-1}$. A strong degeneracy between the cosmic opacity and curvature parameters is also revealed in this analysis.

11 pages, 5 figures

References in corpus (19)

• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Planck evidence for a closed Universe and a possible crisis for cosmology
• Gaussian Process Cosmography
• Cosmological-model-independent tests for the distance-duality relation from Galaxy Clusters and Type Ia Supernova
• The $L-\sigma$ relation for massive bursts of star formation
• An independent determination of the local Hubble constant
• Consistency among distance measurements: transparency, BAO scale and accelerated expansion
• Measurements of $H_0$ and reconstruction of the dark energy properties from a model-independent joint analysis
• New observational constraints on $f(T)$ cosmology from radio quasars
• The HII Galaxy Hubble Diagram Strongly Favors $R_{\mathrm{h}}=ct$ over $\Lambda$CDM
• Testing cosmic opacity from SNe Ia and Hubble parameter through three cosmological-model-independent methods
• Model-independent Constraints on Cosmic Curvature and Opacity
• Constraints on $f(T)$ Cosmology with Pantheon+
• Implications from simulated strong gravitational lensing systems: constraining cosmological parameters using Gaussian Processes
• Revising the Hubble constant, spatial curvature and dark energy dynamics with the latest observations of quasars
• Exploring the "$L$--$\sigma$" relation of HII galaxies and giant extragalactic HII regions acting as standard candles
• Unbiased Cosmic Opacity Constraints from Standard Sirens and Candles
• A Reliable Calibration of HII Galaxies Hubble Diagram with Cosmic Chronometers and Artificial Neural Network

Cited by in corpus (3)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• The impact of 2D and 3D BAO measurements on the Cosmic Distance Duality Relation with HII galaxies
• A Review on Resolving the Hubble Tension via Late-Universe Physics