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arXiv 1205.2385math.FA
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多线性Bohnenblust-Hille不等式最优常数的增长性

On the growth of the optimal constants of the multilinear Bohnenblust--Hille inequality

Daniel Nuñez-Alarcón, Daniel Pellegrino

摘要:

设$(K_{n})_{n=1}^{\infty}$为满足多线性(实或复)Bohnenblust-Hille不等式的最优常数.自八十年前以来,常数$K_{n}$的确切值仍在等待被发现;最近,证明了$(K_{n})_{n=1}^{\infty}$具有亚指数增长。在这份说明中,我们更进一步,并解决以下问题:它是真的,\[ \lim_{n\rightarrow\infty}(K_{n}-K_{n-1}) =0? \]我们的主要结果是一个二分法定理的常数满足Bohnenblust-希勒不等式,特别是我们表明,上述问题的答案基本上是积极的意义上,将是明确的说明。本文证明的二分法的另一个结果是$(K_{n})_{n=1}^{\infty}$具有一种次多项式增长:如果$p(n)$是任意非常数多项式,则$K_{n}$ \textit{is} \textit{not}渐近等于$p(n).$而且,如果\[ q>\log_{2}(\frac{e^{1-1/2γ}}{\sqrt{2}}) \approx0.526, \],则\[ K_{n}\nsim n^{q}. \]

英文摘要:

Let $(K_{n})_{n=1}^{\infty}$ be the optimal constants satisfying the multilinear (real or complex) Bohnenblust--Hille inequality. The exact values of the constants $K_{n}$ are still waiting to be discovered since eighty years ago; recently, it was proved that $(K_{n})_{n=1}^{\infty}$ has a subexponential growth. In this note we go a step further and address the following question: Is it true that \[ \lim_{n\rightarrow\infty}(K_{n}-K_{n-1}) =0? \] Our main result is a Dichotomy Theorem for the constants satisfying the Bohnenblust--Hille inequality; in particular we show that the answer to the above problem is essentially positive in a sense that will be clear along the note. Another consequence of the dichotomy proved in this note is that $(K_{n})_{n=1}^{\infty}$ has a kind of subpolynomial growth: if $p(n)$ is any non-constant polynomial, then $K_{n}$ \textit{is} \textit{not} asymptotically equal to $p(n).$ Moreover, if \[ q>\log_{2}(\frac{e^{1-1/2γ}}{\sqrt{2}}) \approx0.526, \] then \[ K_{n}\nsim n^{q}. \]

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