多项式曲线上极大函数的对数维数界
Logarithmic dimension bounds for the maximal function along a polynomial curve
摘要:
设M表示沿多项式曲线p(t)=(t,t^2,.,t^d)在R^d中:M(f)= sup_{r>0}(1/2 r)\int_{|t|<r}| f(x-p(t))|DT.我们证明了这个算子的L^2-范数最多随参数d几何地增长:||M||_2 < c log d| |f||_2,其中c>0是绝对常数。证明依赖于明确建设的“抛物”半群的运营商,这是一个稳定的半群的混合物。
英文摘要:
Let M denote the maximal function along the polynomial curve p(t)=(t,t^2,...,t^d) in R^d: M(f)=sup_{r>0} (1/2r) \int_{|t|<r} |f(x-p(t))| dt. We show that the L^2-norm of this operator grows at most logarithmically with the parameter d: ||M||_2 < c log d ||f||_2, where c>0 is an absolute constant. The proof depends on the explicit construction of a "parabolic" semi-group of operators which is a mixture of stable semi-groups.
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