La dimensione di Kodaira è un invariante bimeromorfo discreto fondamentale per le varietà kähleriane compatte. Per il teorema di uniformizzazione, due superfici di Riemann compatte hanno la stessa dimensione di Kodaira se e solo se ammettono rivestimenti universali biolomorfi. Questa equivalenza viene completamente meno in dimensione superiore, ma ciononostante, grazie alla classificazione di Enriques-Kodaira, è possibile dimostrare che due superfici kähleriane compatte aventi rivestimenti universali biolomorfi hanno necessariamente la stessa dimensione di Kodaira. Inoltre, nel 1996 H. Tsuji ha dimostrato che, in qualsiasi dimensione, ogni quoziente compatto non ramificato del rivestimento universale di una varietà proiettiva di tipo generale (ossia con dimensione di Kodaira massimale) deve essere anch'esso di tipo generale. In questo seminario presenteremo un lavoro in corso di Anna Choblet, mia studentessa di dottorato (in congiuntamente con B. Claudon), che mira a dimostrare come il risultato di Tsuji resti valido anche in dimensione tre nel caso di dimensione di Kodaira zero.

What do Pokémon, chemistry, and algebraic geometry have in common? The answer is not just that they are all fun, nor that they all have TV series about them. Rather, they are all concerned with collecting and classifying things! In this talk, I will introduce the idea of classification in algebraic geometry and explain how it can be interpreted depending on what one wants to classify, illustrating this with several examples. Finally, I will briefly describe my own contributions to the classification of Fano fourfolds. N.B.: this talk is part of the activity of the MIUR Excellence Department Project Mat-Mod@TOV (CUP E83C23000330006).

In recent years, the analysis of topologically ordered ground states of 2d quantum lattice systems in the thermodynamic limit has been developed to provide a rigorous invariant of gapped phases. The methodology is based on the approach of Doplicher, Haag, and Roberts in the context of algebraic quantum field theory, and derives a braided C*-tensor category which represents the anyonic excitations above the ground state and the fusion and braiding among them.

I will report on a joint work with S. Coughlan, R. Pardini and S. Rollenske. The investigation of (minimal) surfaces of general type with low invariants and their moduli spaces started with the work of Castelnuovo and Enriques and during the last decades of the 20th century many authors continued studying these surfaces. Nowadays Gieseker's moduli space of canonical models of surfaces of general type with K^2 and χ fixed is known to admit a modular compactification, namely the KSBA moduli space, obtained considering stable surfaces. The structure of such moduli space is not completely known and studying stable surfaces with low invariants is a starting point to see concrete examples and studying its properties. The aim of this talk is to give a description of the KSBA moduli space of stable surfaces with K^2=1 and χ=3, showing different ways to construct boundary components. After an overview of the know components, I will focus on the case of 2-Gorenstein surfaces, (with particular attention to the surfaces obtained by gluing two irreducible surfaces) and to the case of normal surfaces having rational singularities.
Note: This talk is part of the activity of the MIUR Department of Excellence Project MatMod@TOV (2023-2027) and the PRIN 2022 Moduli Spaces and Birational Geometry and Prin PNRR 2022 Mathematical Primitives for Post Quantum Digital Signatures

There are classical results showing that if a negatively closed manifold has its horospheres of constant mean curvature then it is locally symmetric. Here we shall present a rigidity result involving the intrinsic Riemannian structure of these horospheres. More precisely if one of them is flat than the closed manifold is locally real hyperbolic. Several questions arose from the approach that we will discuss, in particular concerning replacing the hypothesis on the curvature by the assumption that there is no conjugate points. This is based on a joint work with G. Courtois and S. Hersonsky.

Cercherò di dare un’idea di alcuni dei risultati contenuti nel preprint ArXiv 2508.05105.
Note: This talk is part of the activity of the MIUR Department of Excellence Project MatMod@TOV (2023-2027) and the PRIN 2022 Moduli Spaces and Birational Geometry and Prin PNRR 2022 Mathematical Primitives for Post Quantum Digital Signatures

We give necessary and sufficient conditions for the connectedness of some degeneracy loci. In the special case of Ulrich bundles, these degeneracy loci are called Ulrich subvarieties and we will see that they are always connected with a few exceptions. Joint work with V. Buttinelli and R. Vacca.
Note: This talk is part of the activity of the MIUR Department of Excellence Project MatMod@TOV (2023-2027) and the PRIN 2022 Moduli Spaces and Birational Geometry and Prin PNRR 2022 Mathematical Primitives for Post Quantum Digital Signatures

This presentation explores the emergence of Strange Non-Chaotic Attractors (SNAs) within quasiperiodically forced dynamical systems. We examine two distinct methodologies to rigorously prove the existence of these unique mathematical structures, focusing on recent results. In this work, we analyse a two-parameter family of quasiperiodically forced maps acting on the cylinder. We establish the existence of a continuous bifurcation curve, along which the system undergoes a nonsmooth period-doubling bifurcation. Furthermore, we demonstrate that at this critical parameter value, the closure of the associated attractor possesses a positive two-dimensional Lebesgue measure. We characterize the resulting fractalization by the divergence of the Lipschitz constant of the attracting invariant curve. N.B.: This talk is part of the activity of the MIUR Excellence Department Project Mat-Mod@TOV (CUP E83C23000330006).

This presentation explores the emergence of Strange Non-Chaotic Attractors (SNAs) within quasiperiodically forced dynamical systems. We examine two distinct methodologies to rigorously prove the existence of these unique mathematical structures, focusing on recent results. In this work, we analyse a two-parameter family of quasiperiodically forced maps acting on the cylinder. We establish the existence of a continuous bifurcation curve, along which the system undergoes a nonsmooth period-doubling bifurcation. Furthermore, we demonstrate that at this critical parameter value, the closure of the associated attractor possesses a positive two-dimensional Lebesgue measure. We characterize the resulting fractalization by the divergence of the Lipschitz constant of the attracting invariant curve. N.B.: This talk is part of the activity of the MIUR Excellence Department Project Mat-Mod@TOV (CUP E83C23000330006).

Le superoscillazioni sono un fenomeno che nasce dalla teoria dei misuramenti deboli di Aharonov ma che trovano inaspettate applicazioni in microscopia (superrisoluzione) ed in teoria dei numeri. Da un punto di vista matematico danno origine ad un fenomeno, detto supershift, che imita il comportamento delle funzioni analitiche. La precisa relazione tra queste due nozioni è più complessa di quanto ci si possa aspettare. In questo seminario darò le nozioni di base sulle funzioni superoscillanti e discuterò brevemente le loro applicazioni alla microscopia e alla teoria dei numeri. Concluderò discutendo la nozione di supershift e la sua relazione con il concetto di analiticità.
NB: This talk is part of the activity of the MUR Excellence Department Project MATH@TOV CUP E83C23000330006