Remarks on the nonexistence of biharmonic maps

In this short note we study nonexistence result of biharmonic maps from a complete Riemannian manifold into a Riemannian manifold with nonpositive sectional curvature. Assume that $ϕ:(M,g)\to (N, h)$ is a biharmonic map, where $(M, g)$ is a complete Riemannian manifold and $(N,h)$ a Riemannian manifold with nonpositive sectional curvature, we will prove that $ϕ$ is a harmonic map if one of the following conditions holds: (i) $|dϕ|$ is bounded in $L^q(M)$ and $\int_M|τ(ϕ)|^pdv_g<\infty,$ for some $1\leq q\leq\infty$, $1< p<\infty$; or (ii) $Vol(M)=\infty$ and $\int_M|τ(ϕ)|^pdv_g<\infty,$ for some $1< p<\infty$. In addition if $N$ has negative sectional curvature, we assume that $rankϕ(q)\geq2$ for some $q\in M$ and $\int_M|τ(ϕ)|^pdv_g<\infty,$ for some $1< p<\infty$. These results improve the related theorems due to Baird et al.(cf. \cite{BFO}), Nakauchi et al.(cf. \cite{NUG}), Maeta(cf. \cite{Ma}) and Luo(cf. \cite{Luo}).

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