The monotonicity and high-dimensional limit conjecture for Riesz projection exponents

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For d≥1d\geq1, let pd(q)\mathfrak{p}_d(q) be the critical exponent of the Riesz projection on Td\mathbb{T}^d, and let q(d)\mathfrak{q}(d) be its minimal admissible exponent. Monotonicity and limit conjecture. The function q↦pd(q)q\mapsto\mathfrak{p}_d(q) should be continuous and strictly increasing on [q(d),∞)[\mathfrak{q}(d),\infty). Moreover,

q(d)→2\mathfrak{q}(d)\to2

as d→∞d\to\infty. This is presented as a weaker, more tangible conjecture than the full multidimensional critical exponent conjecture; the paper establishes bounds on q(d)\mathfrak{q}(d) but not this assertion.

References

Primary source

Ole Fredrik Brevig, Adrián Llinares and Kristian Seip, “Critical exponents of the Riesz projection”, arXiv:2402.09787 (2024).

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