I study various different topics in algebraic geometry, representation theory and low-dimensional topology. Sometimes I also study number theory and mathematical physics.

I am particularly interested in the local theory of automorphic forms, especially (weighted) orbital integrals. Relatedly, I study moduli spaces of sheaves supported on singular curves. Recently, I have been getting more into Floer theory as well.

My research is supported by a Väisälä project grant from the the Finnish Academy of Science and Letters.

articles:

• A Lie-theoretic generalization of some Hilbert schemes. Submitted, available at arXiv:2512:08532.
• (with Alexei Oblomkov and Dimitri Wyss) Discriminants and motivic integration. Submitted, available at arXiv:2503:18449.
• (with Cheng-Chiang Tsai) Shalika germs for tamely ramified elements in GL(n). Submitted, available at arXiv:2209.02509. (Video 1, Video 2, slides.)
• (with Nicolas Hemelsoet and Anna Lachowska) On the affine Springer fibers inside the invariant center of the small quantum group. Submitted to Representation Theory, revision in preparation in response to referee report. Available at arXiv:2205.09700. (Video.)
• (with Minh-Tam Trinh) The Hilb-vs-Quot conjecture. arXiv:2310:19633. J. Reine Angew. Math. (Crelle's Journal) (2025).
• (with Eugene Gorsky and Alexei Oblomkov) The affine Springer fiber-sheaf correspondence. arXiv:2204.00303. Advances in Math. 464 (2025). (Video, slides.)
• (with Pablo Boixeda Alvarez and Ivan Losev) Appendix to: Affine Springer fibers, Procesi bundles, and Cherednik algebras. arXiv:2104.09543. Duke Math. J. 173.5 (2024).
• (with Eugene Gorsky and José Simental Rodríguez) IHÉS notes on Algebra and geometry of link homology. arXiv:2108:10356. Bulletin of the LMS 55.2 (2023): 537-591.
• (with Niklas Garner) Generalized affine Springer theory and Hilbert schemes on planar curves. arXiv:2004.15024, IMRN, 8, 6402-6460 (2023).
• Unramified affine Springer fibers and isospectral Hilbert schemes. arXiv:1808.02278, Selecta Mathematica (New Series) 26, 61 (2020).
• (with Yuzhe Bai and Eugene Gorsky) Quadratic ideals and Rogers-Ramanujan recursions. arXiv:1805.01593, The Ramanujan Journal 52 (2020): 67-89.
• Hecke correspondences for Hilbert schemes of reducible locally planar curves. arXiv:1711.06444, Algebraic Geometry (Foundation Compositio Mathematica) 6.5 (2019).

other:

• Sage code to compute Shalika germs, orbital integrals, etc. for GL(n).
• Some hand-written notes on Maulik's proof of the OS/DHS conjecture.
• (with Gurbir Dhillon) Proof of the hard Lefschetz theorem. Chapter 20 of Introduction to Soergel Bimodules. RSME Springer Series (2020).

postdocs:

• GyeongHyeon Nam (Postdoc, 2025-).
• Ikshu Neithalath (Postdoc based at the University of Helsinki, jointly with Kari Vilonen, 2024-).
• Lizao Ye (Postdoc, 2024-).

phd students:

• Emilia Takanen (PhD student, 2024-): Emilia is working on sheaf-theoretic Floer homology.
• Miika Rankaviita (PhD student, 2024-): Miika is working on Poisson and birational geometry.

undergraduate students and summer trainees:

• Ville Uotila (MSc student based at the University of Helsinki, 2025)
• Corentin Vogin (Visiting MSc student from Université de Rennes, 2025)
• Mikko Palojärvi (BSc student & summer trainee, 2025): Gromov-Witten theory and virtual localization
• Michael Yang (Summer trainee, 2024)
• Lassi Virtanen (MSc student, 2024)
• Lauri Karanko (BSc student, 2023): Cyclic sieving in rational q,t-Catalan combinatorics.
• Susanna Terron (MSc student, 2023): Dynamical Quantum Groups.
• Hana Ephremidze (BSc student, 2023): Algebraic closure of local fields in characteristic p>0. Hana's thesis won the Prix Junior Maryam Mirzakhani 2023.

fall 2025 (Aalto):

• Algebraic Geometry I (Period I-II)

spring 2025 (Aalto):

• Advanced topics in algebra: Modern Representation Theory (Period IV)