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SUMMARY:Mingyang Li (Simons Center for Geometry and Physics)
DTSTART:20251028T150000Z
DTEND:20251028T160000Z
DTSTAMP:20260423T022622Z
UID:Geolis/175
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Geolis/175/"
 >Gravitational instantons and harmonic maps</a>\nby Mingyang Li (Simons Ce
 nter for Geometry and Physics) as part of Geometria em Lisboa (IST)\n\n\nA
 bstract\nIt is known from general relativity that axisymmetric stationary 
 black holes can be reduced to axisymmetric harmonic maps into the hyperbol
 ic plane H^2\, while in the Riemannian setting\, 4d Ricci-flat metrics wit
 h torus symmetry can also be locally reduced to such harmonic maps satisfy
 ing a tameness condition. We study such harmonic maps. Applications includ
 e a construction of infinitely many new complete\, asymptotically flat\, R
 icci-flat 4-manifolds with arbitrarily large b_2. Joint work with Song Sun
 .\n
LOCATION:https://researchseminars.org/talk/Geolis/175/
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