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Polyharmonic Almost Complex Structures

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arxiv 1909.09959 v1 pith:B4IEDHJL submitted 2019-09-22 math.DG

Polyharmonic Almost Complex Structures

classification math.DG
keywords almostcomplexstructuresweaklycriticalpolyharmonicproveregularity
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In this paper we consider the existence and regularity of weakly polyharmonic almost complex structures on a compact almost Hermitian manifold $M^{2m}$. Such objects satisfy the elliptic system weakly $[J, \Delta^m J]=0$. We prove a very general regularity theorem for semilinear systems in critical dimensions (with \emph{critical growth nonlinearities}). In particular we prove that weakly biharmonic almost complex structures are smooth in dimension four.

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