📝 SummarXiv

Abstract

This study presents an analysis of cosmological parameters, focusing on resolving the Hubble tension and constraining neutrino masses within a coupled quintom model. By utilizing datasets from the Cosmic Microwave Background (CMB), Pantheon + Analysis, Cosmic Chronometers (CC), Baryon Acoustic Oscillations (BAO), and CMB Lensing, we explore the interplay between cosmological parameters and observational constraints. The model effectively reduces the Hubble tension, achieving a consistency in $H_0$ measurements of $1.37\sigma$ and $1.24\sigma$ for the CMB + ALL dataset For Planck 2018 and R22 respectively. Additionally, the study refines constraints on the total mass of neutrinos ($\Sigma_{m_{\nu}}$), with a finding of $0.115\,\text{eV}$ for the CMB + ALL dataset. The analysis examines the effective equation of state parameter ($w_{\text{eff}}$), indicating a transition towards a universe dominated by exotic energy forms. The combined datasets refine $w_{\text{eff}}$ to $-1.02\pm0.018$, underscoring the importance of multi-dataset integration in understanding dark energy dynamics. Furthermore, the interaction constant $\beta$ between the quintom scalar field and neutrinos is constrained to $0.65 \pm 0.12$ for the CMB + ALL dataset. The potential parameters $\lambda_{\sigma} = -2.09 \pm 0.082$ and $\lambda_{\phi} = 2.43 \pm 0.12$ are also determined, providing insights into the quintom model's implications for cosmological dynamics. This study offers compelling evidence for the coupled quintom model's capability to resolve the Hubble tension and refine constraints on neutrino properties, enhancing our understanding of the universe's evolution.