A Cosmological Uncertainty Relation and Late-Universe Acceleration
arXiv:2604.27771 · doi:10.1103/zgnd-h2xv
Abstract
We propose that the size of the universe and its expansion rate cannot be simultaneously specified with arbitrary precision--a quantum mechanical uncertainty encoded via a deformed commutation relation for the scale factor. This deformation introduces a geometric correction to the Friedmann equation, where the resulting cosmological dynamics are governed entirely by the sign and magnitude of a single free exponent. For a positive exponent, the model predicts late-time dark energy with , leaving a distinct expansion history that is testable by current and next-generation large-scale structure surveys. Conversely, a sufficiently negative exponent yields a nonsingular classical bounce, resolving the big bang singularity. Notably, the model requires no exotic particles or fields and preserves a scale-invariant primordial power spectrum. Rather than operating at the Planck length, this deformation naturally manifests as a horizon-scale phenomenon set by the cosmological horizon. Within this framework, cosmic acceleration emerges as the macroscopic imprint of quantum gravity at the cosmological horizon.
14 pages, 3 figures. Replaced with version accepted for publication in Phys. Rev. D