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Strongly not relatives Kähler manifolds

100%

Zedda M.

Complex Manifolds

2017

tom 4

nr 1

1-6

In this paper we study Kähler manifolds that are strongly not relative to any projective Kähler manifold, i.e. those Kähler manifolds that do not share a Kähler submanifold with any projective Kähler manifold even when their metric is rescaled by the multiplication by a positive constant. We prove two results which highlight some relations between this property and the existence of a full Kähler immersion into the infinite dimensional complex projective space. As application we get that the 1-parameter families of Bergman- Hartogs and Fock-Bargmann-Hartogs domains are strongly not relative to projective Kähler manifolds.

Novikov homology, jump loci and Massey products

88%

Kohno T., Pajitnov A.

Open Mathematics

2014

tom 12

nr 9

1285-1304

Let X be a finite CW complex, and ρ: π 1(X) → GL(l, ℂ) a representation. Any cohomology class α ∈ H 1(X, ℂ) gives rise to a deformation γ t of ρ defined by γ t (g) = ρ(g) exp(t〈α, g〉). We show that the cohomology of X with local coefficients γ gen corresponding to the generic point of the curve γ is computable from a spectral sequence starting from H*(X, ρ). We compute the differentials of the spectral sequence in terms of the Massey products and show that the spectral sequence degenerates in case when X is a Kähler manifold and ρ is semi-simple. If α ∈ H 1(X, ℝ) one associates to the triple (X, ρ, α) the twisted Novikov homology (a module over the Novikov ring). We show that the twisted Novikov Betti numbers equal the Betti numbers of X with coefficients in the local system γ gen. We investigate the dependence of these numbers on α and prove that they are constant in the complement to a finite number of proper vector subspaces in H 1(X, ℝ).

Ograniczanie wyników

1 Complex Manifolds

1 Open Mathematics

1 Kohno T.

1 Pajitnov A.

1 Zedda M.

1 2017

1 2014

Wyniki wyszukiwania

Strongly not relatives Kähler manifolds

Novikov homology, jump loci and Massey products