FOSICAV | Families of Subvarieties in Complex Algebraic Varieties

Summary
In relation with the study of both moduli and enumerative problems in
complex algebraic geometry,
we propose the geometric study of various families of subvarieties of
certain complex algebraic varieties of small dimension, and mainly of
families of (possibly singular) curves. The Severi varieties are a
typical example: they parametrize curves of given degree and geometric
genus in the projective plane; the general such curve has a prescribed
number of ordinary double points and no further singularity.

Apart from exploring their dimensions, smoothness, and irreducibility
properties, we have in mind to determine their Hilbert polynomials
(which among other things encode their degrees, the latter being
important enumerative invariants).

A central feature of our project is to conduct this analysis by
degeneration: to study families of subvarieties in a given variety X,
we let X degenerate and look at what happens in the limit. For
instance, to study curves on a general K3 surface, we can let it
degenerate to a union of projective planes, the dual graph of which is
a triangulation of the real 2-sphere.

We shall consider the following kind of families of subvarieties:
families of curves with prescribed invariants and singularities in
surfaces (with special attention to the two cases of the projective plane,
and of K3 surfaces), families of hyperplane sections with prescribed
singularities of hypersurfaces in projective spaces, families of
curves with a given genus in Calabi-Yau threefolds, and families of
surfaces in the projective 3-space containing curves with unexpected
singularities.
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More information & hyperlinks
Web resources: https://cordis.europa.eu/project/id/652782
Start date: 01-09-2015
End date: 31-08-2017
Total budget - Public funding: 180 277,20 Euro - 180 277,00 Euro
Cordis data

Original description

In relation with the study of both moduli and enumerative problems in
complex algebraic geometry,
we propose the geometric study of various families of subvarieties of
certain complex algebraic varieties of small dimension, and mainly of
families of (possibly singular) curves. The Severi varieties are a
typical example: they parametrize curves of given degree and geometric
genus in the projective plane; the general such curve has a prescribed
number of ordinary double points and no further singularity.

Apart from exploring their dimensions, smoothness, and irreducibility
properties, we have in mind to determine their Hilbert polynomials
(which among other things encode their degrees, the latter being
important enumerative invariants).

A central feature of our project is to conduct this analysis by
degeneration: to study families of subvarieties in a given variety X,
we let X degenerate and look at what happens in the limit. For
instance, to study curves on a general K3 surface, we can let it
degenerate to a union of projective planes, the dual graph of which is
a triangulation of the real 2-sphere.

We shall consider the following kind of families of subvarieties:
families of curves with prescribed invariants and singularities in
surfaces (with special attention to the two cases of the projective plane,
and of K3 surfaces), families of hyperplane sections with prescribed
singularities of hypersurfaces in projective spaces, families of
curves with a given genus in Calabi-Yau threefolds, and families of
surfaces in the projective 3-space containing curves with unexpected
singularities.

Status

CLOSED

Call topic

MSCA-IF-2014-EF

Update Date

28-04-2024
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Horizon 2020
H2020-EU.1. EXCELLENT SCIENCE
H2020-EU.1.3. EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions (MSCA)
H2020-EU.1.3.2. Nurturing excellence by means of cross-border and cross-sector mobility
H2020-MSCA-IF-2014
MSCA-IF-2014-EF Marie Skłodowska-Curie Individual Fellowships (IF-EF)