Asymptotic estimates on the von Neumann inequality for homogeneous polynomials
By the von Neumann inequality for homogeneous polynomials there exists a positive constant Ck,q(n) such that for every k-homogeneous polynomial p in n variables and every n-tuple of commuting operators (T1.... Tn) with ∑n i=1 Tiq ≤ 1 [EQUATION PRESENTED] we have For fixed k and q, we study the asymp...
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| Autores principales: | , , |
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00754102_v2018_n743_p213_Galicer |
| Aporte de: |
| Sumario: | By the von Neumann inequality for homogeneous polynomials there exists a positive constant Ck,q(n) such that for every k-homogeneous polynomial p in n variables and every n-tuple of commuting operators (T1.... Tn) with ∑n i=1 Tiq ≤ 1 [EQUATION PRESENTED] we have For fixed k and q, we study the asymptotic growth of the smallest constant Ck,qn as n (the number of variables/operators) tends to infinity. For q = ∞, we obtain the correct asymptotic behavior of this constant (answering a question posed by Dixon in the 1970s). For 2 ≤ q < ∞ we improve some lower bounds given by Mantero and Tonge, and prove the asymptotic behavior up to a logarithmic factor. To achieve this we provide estimates of the norm of homogeneous unimodular Steiner polynomials, i.e. polynomials such that the multi-indices corresponding to the nonzero coefficients form partial Steiner systems. © 2018 De Gruyter. |
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