2026/07/02 by Jiayuan Huang, Tonghua Liu, Chenggang Shao · 1 voice
Physics and Astronomy · #physics.gen-ph
We constrain three holographic-inspired dark energy models, namely holographic dark energy (HDE), agegraphic dark energy (ADE), and Ricci dark energy (RDE), using late-time observations from cosmic chronometers, Type Ia supernovae (SNe Ia), DESI DR2 baryon acoustic oscillations (BAO), and redshift-space distortion (RSD) growth measurements. Five data combinations are considered: H(z)+Pantheon+, H(z)+DESI DR2+Pantheon+, H(z)+DESI DR2+DES-Dovekie, H(z)+DESI DR2+DESY5, and H(z)+DESI DR2+DES-Dovekie+RSD. We perform Bayesian Markov chain Monte Carlo parameter estimation and compare the models with AIC and BIC. In the BAO-included combinations, HDE gives H0≃67.3--68.0~\mathrm~km~s-1~Mpc-1, Ωm0≃0.270--0.272, and c≃1, indicating an expansion history close to the de Sitter boundary rather than a robust phantom regime. ADE yields a stable agegraphic parameter n≃2.78--2.81, while RDE gives γ≃0.53--0.55 and persistently favors a low matter density, Ωm0≃0.215--0.219. Treating rd as a free parameter reveals a strong negative correlation between H0 and rd, and the RSD-included combination provides a growth-level consistency check through fσ8(z) without constituting a full perturbative stability analysis. None of the three models significantly alleviates the Hubble tension. Overall, HDE shows the most balanced phenomenological behavior among the three models, although current late-time data do not decisively prefer it over ΛCDM.