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Halphen pencils on weighted Fano threefold hypersurfaces

Ivan Cheltsov, Jihun Park (2009)

Open Mathematics

On a general quasismooth well-formed weighted hypersurface of degree Σi=14 a i in ℙ(1, a 1, a 2, a 3, a 4), we classify all pencils whose general members are surfaces of Kodaira dimension zero.

Higgs bundles and representation spaces associated to morphisms

Indranil Biswas, Carlos Florentino (2015)

Archivum Mathematicum

Let G be a connected reductive affine algebraic group defined over the complex numbers, and K G be a maximal compact subgroup. Let X , Y be irreducible smooth complex projective varieties and f : X Y an algebraic morphism, such that π 1 ( Y ) is virtually nilpotent and the homomorphism f * : π 1 ( X ) π 1 ( Y ) is surjective. Define f ( π 1 ( X ) , G ) = { ρ Hom ( π 1 ( X ) , G ) A ρ factors through f * } , f ( π 1 ( X ) , K ) = { ρ Hom ( π 1 ( X ) , K ) A ρ factors through f * } , where A : G GL ( Lie ( G ) ) is the adjoint action. We prove that the geometric invariant theoretic quotient f ( π 1 ( X , x 0 ) , G ) / / G admits a deformation retraction to f ( π 1 ( X , x 0 ) , K ) / K . We also show that the space of conjugacy classes of n almost commuting elements...

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