Smoothing toroidal crossing spaces

We prove the existence of a smoothing for a toroidal crossing space under mild assumptions. By linking log structures with infinitesimal deformations, the result receives a very compact form for normal crossing spaces. The main approach is to study log structures that are incoherent on a subspace of...

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Published in:Forum of mathematics. Pi 2021, Vol.9, Article e7
Main Authors: Felten, Simon, Filip, Matej, Ruddat, Helge
Format: Article
Language:English
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14D15
14J32
14J45
32G05
Algebraic and Complex Geometry
Deformation
Degeneration
Manifolds
Smoothing
Symmetry
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Ruddat, Helge
description We prove the existence of a smoothing for a toroidal crossing space under mild assumptions. By linking log structures with infinitesimal deformations, the result receives a very compact form for normal crossing spaces. The main approach is to study log structures that are incoherent on a subspace of codimension 2 and prove a Hodge–de Rham degeneration theorem for such log spaces that also settles a conjecture by Danilov. We show that the homotopy equivalence between Maurer–Cartan solutions and deformations combined with Batalin–Vilkovisky theory can be used to obtain smoothings. The construction of new Calabi–Yau and Fano manifolds as well as Frobenius manifold structures on moduli spaces provides potential applications.
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subjects 14D15
14J32
14J45
32G05
Algebraic and Complex Geometry
Deformation
Degeneration
Manifolds
Smoothing
Symmetry
title Smoothing toroidal crossing spaces
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