Abstract
We construct smooth Riemannian metrics with constant scalar curvature on each Hirzebruch surface. These metrics respect the complex structures, fiber bundle structures, and Lie group actions of cohomogeneity one on these manifolds. The construction is reduced to an ordinary differential equation called the Duffing equation. An ODE for Bach-flat metrics on Hirzebruch surfaces with large isometry group is also derived.
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Notes
In the present paper, a metric always refers to a (positive-definite) Riemannian metric of class \(C^{\infty }\) unless stated otherwise.
Provided \(m\ge 1\), the connection \({\fancyscript{H}}_m\) is not integrable since the associated principal connection \(\widetilde{{\fancyscript{H}}}_m\) corresponds to \(m\check{\omega }\), the area form \(\check{\omega }\) of the Fubini-Study metric on \(\mathbb {CP}^1\) multiplied by \(m\) (cf. [26]).
For its proof, we note that if \(\phi =\phi (t)\) is a function on \(S^3\times (-T, T)\) depending only on \(t\), then \(X(\phi )=Y(\phi )=V(\phi )=0\) and \(\partial _t(\phi )=\phi '(t)\).
At this moment, the author does not know if a Bach-flat metric of the latter case is locally conformally Einstein (cf. [14]).
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Acknowledgments
A part of this paper is based on [37], written under the supervision of Professor H. Izeki. I express my gratitude to Professor O. Kobayashi for his genuine advice and encouragement after reading an earlier version of the thesis. Professor J. Viaclovsky kindly recommended [4] and [14], thereby reminding me that the constant scalar curvature metrics constructed in the thesis on \(\mathbb {CP}^2\#\overline{\mathbb {CP}}^2\) could be generalized to higher Hirzebruch surfaces, and that the corresponding \(B^t\)-flat analogue should be in presence. I am also grateful to Professor S. Shimomura for helping me understand the Bach-flat equation, and to Professor S. Matsuo for his advice on a preprint of this paper. This work was supported by Japan Society for the Promotion of Science under Research Fellowship for Young Scientists.
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Otoba, N. Constant scalar curvature metrics on Hirzebruch surfaces. Ann Glob Anal Geom 46, 197–223 (2014). https://doi.org/10.1007/s10455-014-9419-z
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DOI: https://doi.org/10.1007/s10455-014-9419-z
Keywords
- Constant scalar curvature
- Bach flat
- Jacobian elliptic functions
- The Duffing equation
- ODE with movable essential singularities
- Riemannian submersions with totally geodesic fibers
- Conformal Kähler submersions