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Sofia TirabassiProfessor

Om mig

 

 

I moved to Stockholm in 2019, first as an associate professor, and now, since June 13th 2024, as a full professor. I earned my docentship in May 2021.
 
Since January 1st 2024 I am the leader of the project project Generic Vanishing and characterization of semiabelian varieties, funded by the VR. Under the Fall 2024 I will also be hosting Rita Pardini who will be a Guest Professor at the department of Mathematics, funded by the Alice och Knut Wallenberg Foundation. . For more information about these projects see the projects tab below.
 
 
I was the pricipal Investigator of the project "Derived Categories in Positive Characteristic" funded by the KAW fundation under the scheme "International Postdoctoral Scholarship" between 2021 and 2023.  I was the manager of the project The Aritmetic of the derived Categories funded by the Research Council of Norway under the scheme "Young Research Talents" for the years 2017-2021.
 
Before coming to Stockholm, I was an associate professor at the University of Bergen,  a Postdoctoral Research Assistant Professor at the Mathematics Department of University of Utah (Salt Lake City (UT), USA), and a Marie Curie Fellow at the Faculty of Mathematics, Informatics and Mechanics, University of Warsaw. This fellowship was awarded by "The ERCIM Alain Bensoussan Fellowship Programme" and was supported by the Marie Curie Co-funding of Regional, National and International Programmes (COFUND) of the European Commission.

In February 2012, I completed my Ph.D. in Mathematics at the Università degli studi Roma TRE with a thesis entitled Syzygies, Pluricanonical Maps and the Birational Geometry of Irregular Varieties, written under the supervision of Prof. G. Pareschi (Università degli studi di Roma "Tor Vergata").

Before entering in the Ph.D. program of the Università degli Studi Roma TRE, I was a student at the University of Bologna where I completed both my B.Sc. in Mathematics (2006) and M.Sc. in Mathematics (2008).
 

 

 

Undervisning

Under läsåret 2024/2025 jag ska underviser den föliände kurser 

  •  Lärare och Examinator för MM3001 -Matematiska metoder för ekonomer (Kurs i kanditatprogram i företagekonomi). 

  • Lärare och Examinator för MM7045 -Galois Theory (Masternivå). 

  • Lärare och Examinator och Huvudlärare för MM5023 Matematik III - Kombinatorik (Advancerad kandidatnivå). 

  • Lärare och Examinator för MM5021- Matematik III - Abstract Algebra (Advancerad kandidatnivå). 

  • Examinator för Självstanding Arbete i Kandidat och Masterprogram i Matematik (Lärarutbiliding inkluderas). 

  • Huvudlärare för MM7052-Topology 

I tilleg fick jag medel från fakulteten för att utvekla en Masternivå kurs i Algebraisk Geometri (som är mitt försking emnet).

Forskning

My primary field of interest is the study of Algebraic Geometry whcih is about the study of geometric object with an algebraic soul. An example of such objects are zero loci of polynomial, like a circle of radious 1, which is the locus of points in the plane satisfying the equation

x^2+y^2-1=0.

One of my main tools are the so called cohomological methods, and currently, I have  two ongoing research directions.

On one side, I  study derived categories and derived invariants of algebraic varieties defined over fields of positive characteristic.  This was the main topic of my Wallenberg International Postdoc Project.

On the other side,  I am  working on finding an effective birational characterization of semiabelian varieties.  This is the main focus of my VR grants and the Wallenberg visiting professor project.

Forskningsprojekt

Generiskt försvinnande och karakterisering av semiabelska varieteter

Detta är ett projekt i algebraisk geometri, matematikområdet som studerar geometriska objekt som kan beskrivas med hjälp av polynomekvationer. Projektet syftar till att utveckla nya tekniker för att studera geometrin av vissa typer av dessa objekt, som kallas semiabelska varieteter.

Three figures: a sphere, a torus (donut shape) and one like two donuts glued together like an 8.

Publikationer

I urval från Stockholms universitets publikationsdatabas

  • Effective characterization of quasi-abelian surfaces

    2023. Margarida Mendes Lopes, Rita Pardini, Sofia Tirabassi. Forum of Mathematics, Sigma 11

    Artikel

    Let V be a smooth quasi-projective complex surface such that the first three logarithmic plurigenera 𝑃1 (𝑉), 𝑃2 (𝑉)and 𝑃3 (𝑉) are equal to 1 and the logarithmic irregularity 𝑞(𝑉) is equal to 2. We prove that the quasi-Albanesemorphism 𝑎𝑉 : 𝑉 → 𝐴(𝑉) is birational and there exists a finite set S such that 𝑎𝑉 is proper over 𝐴(𝑉) \ 𝑆, thusgiving a sharp effective version of a classical result of Iitaka [12].

    Läs mer om Effective characterization of quasi-abelian surfaces

  • A footnote to a theorem of Kawamata

    2023. Margarida Mendes Lopes, Rita Pardini, Sofia Tirabassi. Mathematische Nachrichten 296 (10), 4739-4744

    Artikel

    Kawamata has shown that the quasi-Albanese map of a quasi-projective variety with log-irregularity equal to the dimension and log-Kodaira dimension 0 is birational. In this note, we show that under these hypotheses the quasi-Albanese map is proper in codimension 1 as conjectured by Iitaka. 

    Läs mer om A footnote to a theorem of Kawamata

  • Fourier-Mukai partners of Enriques and bielliptic surfaces in positive characteristic

    2021. Katrina Honigs, Max Lieblich, Sofia Tirabassi. Mathematical Research Letters 28 (1), 65-91

    Artikel

    We prove that a twisted Enriques (respectively, untwisted bielliptic) surface over an algebraically closed field of positive characteristic at least 3 (respectively, at least 5) has no non-trivial Fourier-Mukai partners.

    Läs mer om Fourier-Mukai partners of Enriques and bielliptic surfaces in positive characteristic

  • On the Brauer group of bielliptic surfaces (with an appendix by Jonas Bergström and Sofia Tirabassi)

    2022. Eugenia Ferrari (et al.). Documenta Mathematica 27, 383-425

    Artikel

    We provide explicit generators of the torsion of the second cohomology of bielliptic surfaces, and we use this to study the pullback map between the Brauer group of a bielliptic surface and that of its canonical cover.

    Läs mer om On the Brauer group of bielliptic surfaces (with an appendix by Jonas Bergström and Sofia Tirabassi)

  • Theta-regularity and log-canonical threshold

    2020. Morten Øygarden, Sofia Tirabassi. Mathematica Scandinavica 126 (1), 73-81

    Artikel

    We show that an inequality, proven by Küronya-Pintye, which governs the behavior of the log-canonical threshold of an ideal over Pn and that of its Castelnuovo-Mumford regularity, can be applied to the setting of principally polarized abelian varieties by substituting the Castelnuovo-Mumford regularity with Θ-regularity of Pareschi-Popa.

    Läs mer om Theta-regularity and log-canonical threshold

  • Derived equivalences of canonical covers of hyperelliptic and Enriques surfaces in positive characteristic

    2020. Katrina Honigs, Luigi Lombardi, Sofia Tirabassi. Mathematische Zeitschrift 295, 727-749

    Artikel

    We prove that any Fourier–Mukai partner of an abelian surface over an algebraically closed field of positive characteristic is isomorphic to a moduli space of Gieseker-stable sheaves. We apply this fact to show that the set of Fourier–Mukai partners of a canonical cover of a hyperelliptic or Enriques surface over an algebraically closed field of characteristic greater than three is trivial. These results extend earlier results of Bridgeland–Maciocia and Sosna to positive characteristic.

    Läs mer om Derived equivalences of canonical covers of hyperelliptic and Enriques surfaces in positive characteristic

  • ON ORDINARY ENRIQUES SURFACES IN POSITIVE CHARACTERISTIC

    2020. Roberto Laface, Sofia Tirabassi. Nagoya mathematical journal

    Artikel

    We give a notion of ordinary Enriques surfaces and their canonical lifts in any positive characteristic, and we prove Torelli-type results for this class of Enriques surfaces.

    Läs mer om ON ORDINARY ENRIQUES SURFACES IN POSITIVE CHARACTERISTIC

  • GV-subschemes and their embeddings in principally polarizedabelian varieties

    2015. Luigi Lombardi, Sofia Tirabassi. Mathematische Nachrichten 288 (11-12), 1405-1412

    Artikel

    We prove that any embedding of a GV -subscheme in a principally polarized abelian variety does not factorthrough any nontrivial isogeny. As an application, we present a new proof of a theorem of Clemens–Griffithsidentifying the intermediate Jacobian of a smooth cubic threefold to the Albanese variety of its Fano surface oflines.

    Läs mer om GV-subschemes and their embeddings in principally polarizedabelian varieties

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