Cyclic branched covers of complex hyperbolic manifolds have non-complex-hyperbolic Chern number ratios, proven exactly in dimension 2 and claimed with a gap in higher even dimensions.
An explicit description of the K\"{a}hler-Einstein metrics of Guenancia-Hamenst\"{a}dt
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abstract
Fine and Premoselli (FP) constructed the first examples of manifolds that do not admit a locally symmetric metric but do admit a negatively curved Einstein metric. The manifolds here are hyperbolic branched covers like those used by Gromov and Thurston, and the construction of their model Einstein metric is a variation of the hyperbolic metric written in polar coordinates. Very recently, Guenancia and Hamenst\"{a}dt (GH) proved the existence of the first examples of manifolds that are not locally symmetric but admit a negatively curved K\"{a}hler-Einstein metric. The GH metrics are realized on complex hyperbolic branched covers constructed by Stover and Toledo. In this article we generalize the construction of FP to the complex hyperbolic setting and show that this yields a negatively curved Einstein metric that asymptotically approaches the metric of GH.
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On ratios of Chern numbers for complex hyperbolic branched covers
Cyclic branched covers of complex hyperbolic manifolds have non-complex-hyperbolic Chern number ratios, proven exactly in dimension 2 and claimed with a gap in higher even dimensions.