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Let $f$ be a fixed self-contragradient Hecke-Maass form for $SL(3,\mathbbZ)$, and $u$ an even Hecke-Maass form for $SL(2,\mathbb Z)$ with Laplaceeigenvalue $1/4+k^2$, $k>0$. A subconvexity bound$O\big(k^{4/3+\varepsilon}\big)$ in the eigenvalue aspect is proved for thecentral value at $s=1/2$ of the Rankin-Selberg $L$-function $L(s,f\times u)$.Meanwhile, a subconvexity bound $O\big((1+|t|)^{2/3+\varepsilon}\big)$ in the$t$ aspect is proved for $L(1/2+it,f)$. These bounds improved correspondingsubconvexity bounds proved by Xiaoqing Li (Annals of Mathematics, 2011). Themain technique in the proof, other than those used by Li, is an $n$th-orderasymptotic expansion of a weighted stationary phase integral, for arbitrary$n\geq1$. This asymptotic expansion sharpened the classical result for $n=1$ byHuxley.

Improved subconvexity bounds for GL(2)xGL(3) and GL(3) L-functions by weighted stationary phase