Conformal change of Riemannian metrics and biharmonic maps

Abstract

For the reduction ordinary differential equation due to Baird and Kamissoko \cite{BK} for biharmonic maps from a Riemannian manifold $(M^m,g)$ into another one $(N^n,h)$, we show that this ODE has no global positive solution for every $m\ge 5$. On the contrary, we show that there exist global positive solutions in the case $m=3$. As applications, for the the Riemannian product $(M^3,g)$ of the line and a Riemann surface, we construct the new metric $\tilde{g}$ on $M^3$ conformal to $g$ such that every nontrivial product harmonic map from $M^3$ with respect to the original metric $g$ must be biharmonic but not harmonic with respect to the new metric $\tilde{g}$.

arXiv comment26 pages, 6 figures

References in corpus (2)

• A short survey on biharmonic maps between Riemannian manifolds
• Classifications and Isolation Phenomena of Bi-Harmonic Maps and Bi-Yang-Mills Fields