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arXiv · 2611.09143

Spectral Characterizations, Harmonic Analysis, and Phase Transitions in 2-Nice and $k$-Nice Recurrence

Dibyendu De
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Abstract

We investigate the structural mechanisms governing $2$-nice and $k$-nice recurrence in measure-preserving dynamical systems. For weakly mixing systems, we establish a complete spectral characterization of two-sided $2$-nice recurrence via quadratic spectral functionals and Herglotz--Bochner duality, extending the theory to arbitrary integer polynomial configurations $\{0, p_1(n), p_2(n)\}$ with zero constant term and to actions of countable abelian groups. Using stationary Gaussian processes and Hermite mode decoupling, we construct explicit weakly mixing counterexamples separating one-sided and two-sided $2$-nice recurrence. Furthermore, we uncover a fundamental structural phase transition at $k=3$: while $k=2$ recurrence is rigidly controlled by a quadratic spectral functional whose two-sided symmetrization eliminates all higher-degree cumulants, at $k=3$ fourth-order centered correlations survive symmetrization and can drive a strict recurrence deficit even when the quadratic spectral functional remains strictly positive. Using lacunary and multi-frequency Riesz products alongside uniform Wiener lemmas, we analyze the upper Banach density obstructions of negative spectral sets, establish partial partition regularity on the spectral cone, resolve an inverse Furstenberg correspondence problem of Rodríguez Martín for countable groups via Bernoulli product extensions, and characterize spectral $2$-nice ultrafilters in the Stone--Čech compactification $β\N$.

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BibTeXRIS

Dibyendu De. 2026-11-06. Spectral Characterizations, Harmonic Analysis, and Phase Transitions in 2-Nice and $k$-Nice Recurrence. https://arxiv.org/abs/2611.09143

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