Quantitative time-averaged spherical means along equidistributed spirals: Diophantine rates and limits of uniformity
Abstract
We establish quantitative equidistribution estimates for spherical observables sampled along Kronecker flows. For the monotone measure-preserving inverse-CDF parametrization Φd:𝕋d→𝕊d and a Diophantine frequency of exponent τ, every φ∈ Cs(𝕊d), 0<s≤1, has time averages converging to the spherical mean at rate O(T−ϑ), where ϑ=s/((1+s)(τ+d)), uniformly in the initial phase and averaging window. Since Φd is discontinuous across a polar cut, the proof localizes the pullback away from the polar degeneracies and combines de la Vallée Poussin approximation, Fourier decay, and the Diophantine lower bound. The same exponent holds for a continuous measure-preserving variant. For comparison, mollification followed by Koksma--Hlawka gives, for every ε>0, the rate O(T−s/[d(τ+1)]+ε). Its power exponent is larger exactly when τ(d−1−s)<ds; at equality the nominal exponents coincide, while the localization estimate has no Tε loss. On data vanishing near the polar degeneracies, the cutoff-free argument gives exponent s/(τ+d). We apply the estimates to shrinking spiral-type trajectories, integrable angular data, and homogeneous singularities, including a contrast between power-law and exponential radial contraction. Finally, on 𝕊2, for every prescribed R(T)→0 we construct a rationally independent frequency and a smooth mean-zero observable with |φ|C1≤1 for which the error is not O(R(T)).
Related
BibTeX
@misc{fragomeli2026quantitative,
title = {{Quantitative time-averaged spherical means along equidistributed spirals: Diophantine rates and limits of uniformity}},
author = {Claudio Fragomeli},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.14607},
eprint = {2608.14607},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.14607},
}
RIS
TY - UNPB
TI - Quantitative time-averaged spherical means along equidistributed spirals: Diophantine rates and limits of uniformity
AU - Claudio Fragomeli
PY - 2026
DA - 2026/08/25
PB - arXiv
DO - 10.48550/arxiv.2608.14607
UR - https://arxiv.org/abs/2608.14607
AB - We establish quantitative equidistribution estimates for spherical observables sampled along Kronecker flows. For the monotone measure-preserving inverse-CDF parametrization Φ_d:𝕋^d→𝕊^d and a Diophantine frequency of exponent τ, every φ∈ C^s(𝕊^d), 0<s≤1, has time averages converging to the spherical mean at rate O(T^−ϑ), where ϑ=s/((1+s)(τ+d)), uniformly in the initial phase and averaging window. Since Φ_d is discontinuous across a polar cut, the proof localizes the pullback away from the polar degeneracies and combines de la Vallée Poussin approximation, Fourier decay, and the Diophantine lower bound. The same exponent holds for a continuous measure-preserving variant. For comparison, mollification followed by Koksma--Hlawka gives, for every ε>0, the rate O(T^−s/[d(τ+1)]+ε). Its power exponent is larger exactly when τ(d−1−s)<ds; at equality the nominal exponents coincide, while the localization estimate has no T^ε loss. On data vanishing near the polar degeneracies, the cutoff-free argument gives exponent s/(τ+d). We apply the estimates to shrinking spiral-type trajectories, integrable angular data, and homogeneous singularities, including a contrast between power-law and exponential radial contraction. Finally, on 𝕊^2, for every prescribed R(T)→0 we construct a rationally independent frequency and a smooth mean-zero observable with |φ|_C^1≤1 for which the error is not O(R(T)).
ER -