Barrow Holographic Dark Energy with a Ricci Cutoff in Power-Law f(Q,Lm) Gravity: Late-Time Cosmological Dynamics
Abstract
We investigate late-time Barrow holographic dark energy (BHDE) with Ricci cutoff in f(Q,Lm)=Q+αQn−2Lm gravity. The Qn term modifies the symmetric-teleparallel geometry, while Δ deforms holographic energy via entropy-area relation. Linear matter Lagrangian allows separate identification of geometric and holographic effects. Modified Friedmann equations with Ricci-cutoff BHDE yield a closed first-order equation for E(z)=H(z)/H0, solved numerically. The model evolves from matter domination to late-time acceleration. Increasing n makes wDE,0 less negative, raises zt, lowers j0; increasing Δ makes wDE,0 and q0 more negative, raises zt and j0. Calibrating 𝒞B,ref with q0,ref≃ −0.527 gives wDE,0≃ −1.003, zt≃0.442, j0≃1.486. Two-dimensional (n,Δ) maps show opposite effects on wDE,0 but same direction on acceleration onset. We compare expansion histories with 36 cosmic-chronometer measurements (0.07≤ z≤1.965), using DESI covariance and asymmetric error at z=0.8. Comparison is conditional for fixed trajectories, without fitting; Hubble statistic varies modestly. Results provide a consistent background realization of Ricci-cutoff BHDE in f(Q,Lm) gravity and motivate future perturbation and multi-probe studies.
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BibTeX
@misc{tavakoli2026barrow,
title = {{Barrow Holographic Dark Energy with a Ricci Cutoff in Power-Law $f(Q,L_m)$ Gravity: Late-Time Cosmological Dynamics}},
author = {S. Tavakoli and T. Golanbari and B. Malekolkalami and Kh. Saaidi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01629},
eprint = {2609.01629},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01629},
}
RIS
TY - UNPB
TI - Barrow Holographic Dark Energy with a Ricci Cutoff in Power-Law f(Q,L_m) Gravity: Late-Time Cosmological Dynamics
AU - S. Tavakoli
AU - T. Golanbari
AU - B. Malekolkalami
AU - Kh. Saaidi
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01629
UR - https://arxiv.org/abs/2609.01629
AB - We investigate late-time Barrow holographic dark energy (BHDE) with Ricci cutoff in f(Q,L_m)=Q+αQ^n−2L_m gravity. The Q^n term modifies the symmetric-teleparallel geometry, while Δ deforms holographic energy via entropy-area relation. Linear matter Lagrangian allows separate identification of geometric and holographic effects. Modified Friedmann equations with Ricci-cutoff BHDE yield a closed first-order equation for E(z)=H(z)/H_0, solved numerically. The model evolves from matter domination to late-time acceleration. Increasing n makes w_DE,0 less negative, raises z_t, lowers j_0; increasing Δ makes w_DE,0 and q_0 more negative, raises z_t and j_0. Calibrating 𝒞_B,ref with q_0,ref≃ −0.527 gives w_DE,0≃ −1.003, z_t≃0.442, j_0≃1.486. Two-dimensional (n,Δ) maps show opposite effects on w_DE,0 but same direction on acceleration onset. We compare expansion histories with 36 cosmic-chronometer measurements (0.07≤ z≤1.965), using DESI covariance and asymmetric error at z=0.8. Comparison is conditional for fixed trajectories, without fitting; Hubble statistic varies modestly. Results provide a consistent background realization of Ricci-cutoff BHDE in f(Q,L_m) gravity and motivate future perturbation and multi-probe studies.
ER -