Information geometry of DGLAP evolution
Abstract
Quark and gluon splittings shift proton momentum toward smaller fractions with increasing resolution. Momentum conservation makes the summed momentum-weighted quark and gluon densities, when nonnegative, a probability distribution. We apply information geometry, the geometry of probability distributions, to this probabilistic form of Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution. We evaluate, to our knowledge for the first time, the speed at which the shape of the proton's momentum distribution changes, measured by how well distributions at neighboring resolutions can be told apart statistically. We show that this speed has a closed-form lower bound at leading order, with one-loop splitting functions and running coupling, five fixed quark flavors, nonnegative quark and gluon densities and sufficiently regular inputs. Three numbers of the input (the distribution at the starting resolution) fix the bound at every scale without computing the evolved distribution, once the coupling is specified. The squared bound is at least 94.8 percent of the squared speed for three of the five model inputs at four scales from 2 GeV to 10 TeV. The bound is reached when the distribution's relative rate of change is linear in the logarithm of the inverse momentum fraction. The relative rate of change is close to this linear form in mean square weighted by momentum for these three model inputs at all four scales, and closer still to linear in the square root of the logarithm at the three higher scales. These descriptions are compatible because the logarithm and its square root are strongly correlated when weighted by these momentum distributions.
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BibTeX
@misc{bondarenko2026information,
title = {{Information geometry of DGLAP evolution}},
author = {Sergey Bondarenko and Alex Prygarin},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.28115},
eprint = {2610.28115},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.28115},
}
RIS
TY - UNPB
TI - Information geometry of DGLAP evolution
AU - Sergey Bondarenko
AU - Alex Prygarin
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.28115
UR - https://arxiv.org/abs/2610.28115
AB - Quark and gluon splittings shift proton momentum toward smaller fractions with increasing resolution. Momentum conservation makes the summed momentum-weighted quark and gluon densities, when nonnegative, a probability distribution. We apply information geometry, the geometry of probability distributions, to this probabilistic form of Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution. We evaluate, to our knowledge for the first time, the speed at which the shape of the proton's momentum distribution changes, measured by how well distributions at neighboring resolutions can be told apart statistically. We show that this speed has a closed-form lower bound at leading order, with one-loop splitting functions and running coupling, five fixed quark flavors, nonnegative quark and gluon densities and sufficiently regular inputs. Three numbers of the input (the distribution at the starting resolution) fix the bound at every scale without computing the evolved distribution, once the coupling is specified. The squared bound is at least 94.8 percent of the squared speed for three of the five model inputs at four scales from 2 GeV to 10 TeV. The bound is reached when the distribution's relative rate of change is linear in the logarithm of the inverse momentum fraction. The relative rate of change is close to this linear form in mean square weighted by momentum for these three model inputs at all four scales, and closer still to linear in the square root of the logarithm at the three higher scales. These descriptions are compatible because the logarithm and its square root are strongly correlated when weighted by these momentum distributions.
ER -