$L^2\times L^2\times L^2\to L^{2/3}$ boundedness for trilinear multiplier operator

Abstract

This paper discusses the boundedness of the trilinear multiplier operator $T_m(f_1,f_2,f_3)$, when the multiplier satisfies a certain degree of smoothness but with no decaying condition and is $L^q$-integrable with an admissible range of $q$. The boundedness is stated in the terms of $\Vert m{\Vert }_{L^q}$. In particular, \begin{equation*}\|T_{m}\|_{L^2\times L^2\times L^2\to L^{2/3}}\lesssim\|m\|_{L^{q}}^{q/3}.\end{equation*}

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