Khabibullin's conjecture for nonnegative logarithmically convex functions

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Let S(t)S(t) be a nonnegative increasing function on [0,+∞)[0,+\infty) that is convex with respect to log⁡t\log t. Let ρ>1\rho>1 and let n≥2n\geq 2 be an integer. If

∫01S(tx)(1−x2)n−2 dx≤tρ(t≥0),\int_0^1 S(tx)(1-x^2)^{n-2}\,dx\leq t^{\rho}\qquad (t\geq 0),

then

∫0+∞S(t)t2ρ−1(1+t2ρ)2 dt≤π(n−1)2ρ∏k=1n−1(1+ρ2k).\int_0^{+\infty}S(t)\frac{t^{2\rho-1}}{(1+t^{2\rho})^2}\,dt\leq \frac{\pi(n-1)}{2\rho}\prod_{k=1}^{n-1}\left(1+\frac{\rho}{2k}\right).

Khabibullin's conjecture. The stated integral implication holds for every such SS, every ρ>1\rho>1, and every integer n≥2n\geq 2. This is an extremal integral inequality arising in the Paley problem for plurisubharmonic functions of lower order greater than 11; the supplied source does not establish whether the conjecture is resolved.

References

Primary source

Arian Bërdëllima, “On sharp constants in Paley problem for plurisubharmonic functions of lower order ρ>1”, arXiv:2105.04275 (2021).

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