I am a Juniorprofessor for Algebraic Geometry at the Faculty of Mathematics at Ruhr-University Bochum. My research focus lies in birational geometry. Some of the objects and questions that I like are: groups of automorphisms of complex algebraic varieties, various cones (nef, movable, big, effective) providing notions of positivity for divisors on complex projective varieties, the Morrison-Kawamata-Totaro cone conjecture, techniques of the Minimal Model Program, positivity properties of the (co)tangent sheaves and their Chern classes, families of rational curves deforming in a (most often Fano) variety.

Before coming to Bochum, I obtained my Ph.D. in February 2023 at Université Côte d'Azur under the supervision of Andreas Höring.

From May 2023 to September 2024, I worked as a postdoctoral fellow in the group led by Gavril Farkas at Humboldt-Universität zu Berlin.

I am the Mercator fellow of the SFB-TRR 195 Symbolic Tools in Mathematics and their Applications. Congratulations to the PIs for securing this third extension!

I'm an associated foreign member of the ANR project Groups in Algebraic Geometry (GAG).

What's up here in Bochum

• September 15th-16th in Bochum: Together with Daniel Greb and Christian Lehn, we are organizing a workshop on the proof of the b-semiampleness conjecture and on interactions between Hodge theory and birational geometry more broadly. More information (including the registration form) are here.
• Our Oberseminar on Algebraic and Complex Geometry resumes for the Winter Term 26/27. It takes place on Thursdays from 14 to 16. The speakers line-up will be available soon on my events page.
• I'll be teaching Birational Geometry in the Winter Term 26/27. More information on my teaching page.

Where I'll be next

• September 9th 2026: Presentation "Positivitätskegeln und Symmetriegruppen in der birationalen Geometrie" at the scientific meeting of the Class for Natural Sciences and Medicine of the Northrhine-Westfalian Academy for Sciences and Arts in Düsseldorf.
• September 11th 2026: Wahrheit im Wandel. An event organized by the Junges Kolleg of the Northrhine-Westfalian Academy for Sciences and Arts in Düsseldorf.
• September 15th-16th 2026: Organizing the Workshop "Interactions between Hodge theory and birational geometry" at RUBochum.
• September 23th-25th 2026: Speaking at the CARE Workshop at RUBochum.
• October 14th 2026: Leo-Brandt Veranstaltung at the Northrhine-Westfalian Academy for Sciences and Arts in Düsseldorf.
• November 9th-13th 2026: Complex Geometry Conference at IBS Center for Complex Geometry, Daejon, South Korea.
• November 16th-24th 2026: Visiting my collaborator Hsueh-Yung Lin at National Taiwan University.
• February 17th-19th 2027: Giving a minicourse at the Milano Winter School on Algebra and Geometry.
• March 7th-12th 2027: BIRS Workshop "Harmony between Real and Complex Algebraic Geometry", Banff, Canada.
• March 15th-19th 2027: Organizing and giving a minicourse at our event for advanced undergraduate students "Bochum Primer on Algebra and Geometry".
• May 24th-29th 2027: Attending and speaking at a Workshop on Complex Geometry in Toulouse, France.

My collaborators' webpages

• Tien-Cuong Dinh
• Hsueh-Yung Lin
• Zhining Liu
• Joaquí­n Moraga
• Keiji Oguiso
• Isabel Stenger
• Long Wang
• Xun Yu

Contact

You can write to me at cecile.gachet (arobase) rub.de.

Office IB3/89, Postfach 45
Note that the building is named IB, and that my office is on the floor numbered 3 (not to be confused with 03).

A map is displayed at the entrance of the campus, you can also find one here. A quick summary: Coming with the U35, stop at Ruhr-Universität. Exiting the station, go to your right towards the campus. After 100 meters, you should see the library. Circle it to the left. Looking farther to the left and down, you should see three large parallel, modern-looking buildings: IB is the second-closest to where you stand.