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Observational constraints on fractional holographic dark energy in the light of DESI DR2 · arXivDesk

2608.09379Aug 10, 2026It is to be published in Chinese Physics C

Observational constraints on fractional holographic dark energy in the light of DESI DR2

Qihong Huang, Yuchen Zhang, Bing Xu, Kaituo Zhang

General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics

Abstract

Based on the fractional entropy from fractional quantum mechanics, fractional holographic dark energy (FHDE) has been proposed with the Hubble horizon as the IR cutoff (FHDEH). We extend this framework by adopting the future event horizon and the particle horizon as the IR cutoff, proposing the FHDEF and FHDEP models. Using the SN+OHD+DESI DR2 dataset to constrain these models, we find that all three models provide a marginally lower $χ^{2}_{min}$ compared to $Λ$ CDM but without significant preference according to AIC and BIC. When CMB distance priors are included, the FHDEH and FHDEP models are strongly ruled out. We further analyze the cosmological evolution for these models, and find that only the FHDEF model predicts nearly identical evolutions of $Ω_{m}$

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The paper addresses: Observational constraints on fractional holographic dark energy in the light of DESI DR2.
Based on the fractional entropy from fractional quantum mechanics, fractional holographic dark energy (FHDE) has been proposed with the Hubble horizon as the IR cutoff (FHDEH).