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Infinitely many solutions to the Yamabe problem on noncompact manifolds

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Bettiol,  Renato G.
Max Planck Institute for Mathematics, Max Planck Society;

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Bettiol, R. G., & Piccione, P. (2018). Infinitely many solutions to the Yamabe problem on noncompact manifolds. Annales de l'Institut Fourier, 68(2), 589-609. doi:10.5802/aif.3172.


Cite as: https://hdl.handle.net/21.11116/0000-0003-FCD6-0
Abstract
We establish the existence of infinitely many complete metrics with constant scalar curvature on prescribed conformal classes on certain noncompact product manifolds. These include products of closed manifolds with constant positive scalar curvature and simply-connected symmetric spaces of noncompact or Euclidean type; in particular, $\mathbb S^m \times\mathbb R^d$, $m\geq2$, $d\geq1$, and $\mathbb S^m\times\mathbb H^d$, $2\leq d<m$. As a consequence, we obtain infinitely many periodic solutions to the singular Yamabe problem on $\mathbb S^m\setminus\mathbb S^k$, for all $0\leq k<(m-2)/2$, the maximal range where nonuniqueness is possible. We also show that all Bieberbach groups in $Iso(\mathbb R^d)$ are periods of bifurcating branches of solutions to the
Yamabe problem on $\mathbb S^m\times\mathbb R^d$, $m\geq2$, $d\geq1$.