Observational constraints on fractional holographic dark energy in the light of DESI DR2
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 χ2min compared to ΛCDM 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 Ωm and Ωde to those of the ΛCDM model across cosmic history, but its deceleration parameter q deviate from the ΛCDM model in the future, indicating richer late time dynamics beyond the standard ΛCDM cosmology.
Versions
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BibTeX
@misc{huang2026observational,
title = {{Observational constraints on fractional holographic dark energy in the light of DESI DR2}},
author = {Qihong Huang and Yuchen Zhang and Bing Xu and Kaituo Zhang},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.09379},
eprint = {2608.09379},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.09379},
}
RIS
TY - UNPB
TI - Observational constraints on fractional holographic dark energy in the light of DESI DR2
AU - Qihong Huang
AU - Yuchen Zhang
AU - Bing Xu
AU - Kaituo Zhang
PY - 2026
DA - 2026/08/10
PB - arXiv
DO - 10.48550/arxiv.2608.09379
UR - https://arxiv.org/abs/2608.09379
AB - 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 ΛCDM 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 and Ω_de to those of the ΛCDM model across cosmic history, but its deceleration parameter q deviate from the ΛCDM model in the future, indicating richer late time dynamics beyond the standard ΛCDM cosmology.
ER -