27–31 Oct 2025
Palazzo del Castelletto
Europe/Rome timezone

Rational curves on very general complete intersections of high degree.

27 Oct 2025, 11:00
1h
Aula Dini (Palazzo del Castelletto)

Aula Dini

Palazzo del Castelletto

Via del Castelletto, 17/1, 56126 Pisa PI

Speaker

Gianluca Pacienza (Université de Lorraine)

Description

I will report on a joint work-in-progress with F. Bastianelli. It is well known thanks to Ein that very general complete intersections of multidegree (d_1,…,d_c) in the projective n-space do not contain rational curves as soon as d_1+…+d_c > 2n-c-1. This result has been sharpened in the case of hypersurfaces thanks to a method introduced by Voisin that inspired further work by Clemens, Ran and myself. Despite more recent work by Coskun, Riedl, Yang, Abe and others in the hypersurface case, Ein’s result has not been improved in the case of higher codimension. The goal of the project is to do so. I will illustrate the main steps of the proof with particular emphasis on a key intermediate result consisting in the proof of the integrability of a certain distribution that naturally comes into the picture.

Primary author

Gianluca Pacienza (Université de Lorraine)

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