Lipschitz characterization of Fock spaces via the Fock distance

Let FαpF^p_\alpha be the Fock space on Cn{\mathbb C}^n, let Lp(Cn,dv)L^p({\mathbb C}^n,dv) be Lebesgue LpL^p space, and let dα(z,w)d_\alpha(z,w) be the distance function associated with the Fock space parameter α\alpha. Suppose α>0\alpha>0, 0<p0<p\le\infty, and ff is an entire function on Cn{\mathbb C}^n. Fock-space Lipschitz conjecture. The function ff belongs to FαpF^p_\alpha if and only if there exists a non-negative continuous function gLp(Cn,dv)g\in L^p({\mathbb C}^n,dv) such that

f(z)f(w)dα(z,w)[g(z)+g(w)]|f(z)-f(w)|\le d_\alpha(z,w)\left[g(z)+g(w)\right]

for all z,wCnz,w\in{\mathbb C}^n. This would provide a Lipschitz-type characterization of Fock spaces analogous to the known characterization of Bergman spaces; the paper notes that the relevant distance estimates are not yet sufficiently understood.

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Primary source

Guanlong Bao, Pan Ma and Kehe Zhu, “New characterizations for Fock spaces”, arXiv:2504.00545 (2025).

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