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 Estimates for Schr\"{o}dinger maximal operators along curve with complex time J. Korean Math. Soc. 2020 Vol. 57, No. 1, 89-111 https://doi.org/10.4134/JKMS.j180558Published online January 1, 2020 Yaoming Niu, Ying Xue Baotou Teachers' College of Inner Mongolia University of Science and Technology; Baotou Teachers' College of Inner Mongolia University of Science and Technology Abstract : In the present paper, we give some characterization of the $L^{2}$ maximal estimate for the operator $P_{a,\gamma}^{t}f\big(\Gamma(x,t)\big)$ along curve with complex time, which is defined by $$P_{a,\gamma}^{t}f\big(\Gamma(x,t)\big) =\int_{\mathbb{R}} e^{i\Gamma(x,t)\xi}e^{it|\xi|^{a}} e^{-t^{\gamma}|\xi|^{a}} \hat{f}(\xi)d\xi,$$ where $t,\gamma>0$ and $a\geq2,$ curve $\Gamma$ is a function such that $\Gamma:\mathbb{R}\times[0,1]\rightarrow\mathbb{R},$ and satisfies H\"{o}lder's condition of order $\sigma$ and bilipschitz conditions. The authors extend the results of the Schr\"{o}dinger type with complex time of Bailey \cite{Bailey} and Cho, Lee and Vargas \cite{CLV} to Schr\"{o}dinger operators along the curves. Keywords : Schr\"{o}dinger equation, curve, maximal operator, global estimate, local estimate MSC numbers : Primary 42B25; Secondary 35Q55 Supported by : The work is supported by NSFC (No.11661061, No.11561062, No.11761054), Inner Mongolia University scientific research projects (No. NJZY17289, NJZY19186), and the natural science foundation of Inner Mongolia (No.2019MS01003). Downloads: Full-text PDF   Full-text HTML