arXiv subjects

Jia-Jun Yin

Publications and source records attributed to Jia-Jun Yin.

3 recordsLinked to original sources

arXiv2026

A parameterized equation of state for dark energy and Hubble Tension

We propose a parameterized equation of state for dark energy and perform observational tests with the Hubble parameter measurements, the Pantheon supernova sample, and DESI DR2 data. We obtain the best-fit values for the parameters as: $H_0 = 73.28\pm 0.15~\mathrm{km\,s^{-1}\, Mpc^{-1}}$, $Ω_{\rm m} = 0.316\pm 0.011$, and $α= 0.00032\pm 0.00046$, demonstrating that the model exhibits a high degree of consistency with astronomical observations and provides a promising parameterized method for addressing the Hubble tension.

gr-qc↗

arXiv2025

Regular hairy black holes through gravitational decoupling method

Within a framework requiring a well-defined event horizon and matter obeying the weak energy condition, we employ gravitational decoupling method to construct non-singular hairy black holes: spherically or axially symmetric. These solutions arise from a deformation of the Minkowski vacuum, where the maximum deformation can yield the Schwarzschild metric for the static case, and the Kerr geometry for the stationary case, respectively.

gr-qc↗

arXiv2024

A new parametrization of Hubble function and Hubble tension

We present a new Hubble parameterization method and employ observational data from Hubble, Pantheon, and Baryon Acoustic Oscillations to constrain model parameters. The proposed method is thoroughly validated against these datasets, demonstrating a robust fit to the observational data. The obtained best-fit values are $H_0 = 67.5^{+1.3}_{-1.6}$ $\text{km s}^{-1} \text{Mpc}^{-1}$, $Ω_{\rm{m0}} = 0.2764\pm{0.0094}$, and $α= 0.33\pm{0.22}$, consistent with the Planck 2018 results, highlighting the existence of Hubble tension.

gr-qc↗