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arXiv · 1812.10565

Concentration phenomena for the fractional $Q$-curvature equation in dimension 3 and fractional Poisson formulas

Azahara DelaTorre·Maria del Mar Gonzalez·Ali Hyder·Luca Martinazzi
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Abstract

We study the compactness properties of metrics of prescribed fractional $Q$-curvature of order $3$ in $\R^3$. We will use an approach inspired from conformal geometry, seeing a metric on a subset of $\R^3$ as the restriction of a metric on $\R^4_+$ with vanishing fourth-order $Q$-curvature. We will show that a sequence of such metrics with uniformly bounded fractional $Q$-curvature can blow up on a large set (roughly, the zero set of the trace of a nonpositive biharmonic function $\Phi$ in $\R^4_+$), in analogy with a $4$-dimensional result of Adimurthi-Robert-Struwe, and construct examples of such behaviour. In doing so, we produce general Poisson-type representation formulas (also for higher dimension), which are of independent interest.

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Azahara DelaTorre, Maria del Mar Gonzalez, Ali Hyder, Luca Martinazzi. 2018-12-26. Concentration phenomena for the fractional $Q$-curvature equation in dimension 3 and fractional Poisson formulas. https://doi.org/10.1112/jlms.12437

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