Late-Time Cosmological Tests of a Minisuperspace Generalized-Uncertainty-Principle Deformation
Abstract
The investigation of possible quantum-gravity effects in cosmology is of considerable interest, especially when such effects can be tested against observations of the late-time expansion. In the present work we study a quadratic generalized-uncertainty-principle (GUP) deformation of the FLRW minisuperspace Poisson algebra. At first order in the deformation parameter, the construction modifies the Friedmann equation and hence the homogeneous expansion history. Since it does not determine a unique perturbation sector, we restrict the analysis to background observables, using 31 cosmic-chronometer measurements, the uncalibrated 1580-object Pantheon+ Hubble-flow sample, and the 13-component DESI DR2 baryon-acoustic-oscillation likelihood, while treating the sound horizon as a nuisance parameter. We compare the resulting cosmology with flat \LCDM{} and with the Chevallier--Polarski--Linder parametrization. For the baseline normalization we obtain betastar=−0.086+0.040−0.032 at 68% credibility and −0.142<betastar<0.005 at 95% credibility.
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BibTeX
@misc{nashed2026latetime,
title = {{Late-Time Cosmological Tests of a Minisuperspace Generalized-Uncertainty-Principle Deformation}},
author = {G. G. L. Nashed},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2607.25745},
eprint = {2607.25745},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.25745},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Late-Time Cosmological Tests of a Minisuperspace Generalized-Uncertainty-Principle Deformation
AU - G. G. L. Nashed
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2607.25745
UR - https://arxiv.org/abs/2607.25745
AB - The investigation of possible quantum-gravity effects in cosmology is of considerable interest, especially when such effects can be tested against observations of the late-time expansion. In the present work we study a quadratic generalized-uncertainty-principle (GUP) deformation of the FLRW minisuperspace Poisson algebra. At first order in the deformation parameter, the construction modifies the Friedmann equation and hence the homogeneous expansion history. Since it does not determine a unique perturbation sector, we restrict the analysis to background observables, using 31 cosmic-chronometer measurements, the uncalibrated 1580-object Pantheon+ Hubble-flow sample, and the 13-component DESI DR2 baryon-acoustic-oscillation likelihood, while treating the sound horizon as a nuisance parameter. We compare the resulting cosmology with flat \LCDM{} and with the Chevallier--Polarski--Linder parametrization. For the baseline normalization we obtain betastar=−0.086^+0.040_−0.032 at 68% credibility and −0.142<betastar<0.005 at 95% credibility.
ER -