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- W2803559983 abstract "Every harmonic map is an intrinsic bi-harmonic map as an absolute minimizer of the intrinsic bi-energy functional, therefore intrinsic bi-harmonic map and its heat flow are more geometrically natural to study, but they are also considerably more difficult analytically than the extrinsic counterparts due to the lack of coercivity for the intrinsic bi-energy. In this paper, we show an energy convexity and thus uniqueness for weakly intrinsic bi-harmonic maps from the unit $4$-ball $B_1 subset mathbf{R}^4$ into the sphere $mathbf{S}^n$. This is a higher-order analogue of the energy convexity and uniqueness for weakly harmonic maps on unit $2$-disk in $mathbf{R}^2$ proved by Colding and Minicozzi cite{CM08} (see also Lamm and the second author cite{LL13}). In particular, this yields a version of uniqueness of weakly harmonic maps on the unit $4$-ball which is new. As an application, we also show a version of energy convexity along the intrinsic bi-harmonic map heat flow into $mathbf{S}^n$, which in particular yields the long-time existence of the intrinsic bi-harmonic map heat flow, a result that was until now only known assuming the non-positivity of the target manifolds by Lamm cite{Lamm05}. Moreover, the energy convexity along the flow yields the uniform convergence of the flow which is not known before. One of the key ingredients in our proofs is a refined version of the $epsilon$-regularity of the first author and Rivi`{e}re cite{LaR}." @default.
- W2803559983 created "2018-06-01" @default.
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- W2803559983 date "2022-11-24" @default.
- W2803559983 modified "2023-09-26" @default.
- W2803559983 title "Energy convexity of intrinsic bi-harmonic maps and applications I: spherical target" @default.
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