Nonlocal Gravity, Restricted CPL Dynamics and DESI Constraints
Abstract
Nonlocal modifications of gravity provide a theoretically motivated framework in which cosmic acceleration can emerge dynamically without introducing a fundamental cosmological constant. We revisit the cosmological predictions of the Maggiore--Mancarella nonlocal R Box−2R model, with particular emphasis on its background dynamics and observational viability in light of recent DESI baryon acoustic oscillation measurements. A key feature of the theory is its predictive character: for fixed standard cosmological parameters, each value of the nonlocal parameter determines a specific effective pair (w0,wa), so that the model traces a restricted trajectory in the Chevallier--Polarski--Linder plane rather than spanning the full phenomenological parameter space. We construct this mapping explicitly and confront the model with observations by implementing its cosmological dynamics in a Boltzmann solver and performing a Markov chain Monte Carlo analysis using Cosmic Microwave Background, supernova, and DESI BAO data. We find that current datasets constrain the nonlocal parameter close to the ΛCDM limit, with no statistically significant preference for nonlocal deviations.
Related
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BibTeX
@misc{amendola2026nonlocal,
title = {{Nonlocal Gravity, Restricted CPL Dynamics and DESI Constraints}},
author = {Luca Amendola and Ismael Ayuso and Amlan Chakraborty and Javier Rubio and Subinoy Das},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20720},
eprint = {2610.20720},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20720},
}
RIS
TY - UNPB
TI - Nonlocal Gravity, Restricted CPL Dynamics and DESI Constraints
AU - Luca Amendola
AU - Ismael Ayuso
AU - Amlan Chakraborty
AU - Javier Rubio
AU - Subinoy Das
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20720
UR - https://arxiv.org/abs/2610.20720
AB - Nonlocal modifications of gravity provide a theoretically motivated framework in which cosmic acceleration can emerge dynamically without introducing a fundamental cosmological constant. We revisit the cosmological predictions of the Maggiore--Mancarella nonlocal R Box^−2R model, with particular emphasis on its background dynamics and observational viability in light of recent DESI baryon acoustic oscillation measurements. A key feature of the theory is its predictive character: for fixed standard cosmological parameters, each value of the nonlocal parameter determines a specific effective pair (w_0,w_a), so that the model traces a restricted trajectory in the Chevallier--Polarski--Linder plane rather than spanning the full phenomenological parameter space. We construct this mapping explicitly and confront the model with observations by implementing its cosmological dynamics in a Boltzmann solver and performing a Markov chain Monte Carlo analysis using Cosmic Microwave Background, supernova, and DESI BAO data. We find that current datasets constrain the nonlocal parameter close to the ΛCDM limit, with no statistically significant preference for nonlocal deviations.
ER -