I am a postdoc in mathematics at Stockholms Universitet in the group of Dan Petersen. Before that I was a postdoc at the University of Cambridge in the group of Oscar Randal-Williams, and even before I was a PhD student at Københavns Universitet under the supervision of Søren Galatius.

Research Interests

I am interested in interactions between algebraic topology and algebraic geometry. My current work focuses on using homotopy theoretic methods to uncover homological stability phenomena for moduli spaces coming from complex algebraic geometry. More broadly, I am also interested in moduli spaces of manifolds, embedding calculus and other applications of homotopy theory to geometry. I can occasionally be seen daydreaming about point counting and enumerative geometry.

Preprints

• Weiss derivatives of holomorphic maps. Summary: I use the functoriality in V of the projective space P(V) to apply the unitary calculus of Weiss to the study of the stable homotopy type of the space of holomorphic maps to projective space. (Some very natural topological posets of projective subspaces appear, I’d be very happy to know if they show up in other settings as well. Please tell me if you know anything about them!)
• Families of algebraic and continuous maps to P^m. Summary: I explain how the comparison between algebraic and continuous maps to projective space works when the source variety varies in a moduli.
• The topology of spaces of holomorphic maps to projective space. Summary: I show that the spaces of holomorphic and continuous maps from a smooth complex projective variety to a projective space have isomorphic homology in a range depending on the degree of the maps.
• Homological stability for the space of hypersurfaces with marked points, with Ronno Das. Summary: We construct a commutative differential graded algebra which computes in a range of degrees the cohomology of the universal smooth hypersurface bundle with marked points. Explicit computations can then be made using a computer. Our result is a topological counterpart to results of Howe on motivic random hypersurfaces, and thus strengthens the analogy between motivic statistics and homological stability.
• Scanning the moduli of smooth hypersurfaces. Summary: I construct a scanning map from the locus of smooth hypersurfaces in the Hilbert scheme of a smooth complex projective variety, and show that it induces an isomorphism in integral homology in a range of degrees. This allows rational computations of homology and leads to homological stability in some cases. I also show that this stable cohomology coincides with that of a more topological moduli space, using tangential structures and the work of Galatius and Randal-Williams on classifying spaces of diffeomorphism groups.

Publications

• Appendix to Chow ring of the stack of plane nodal curves (ArXiv) by Alessio Cela, Ajith Urundolil Kumaran, Xiaohan Yan. International Mathematics Research Notices (IMRN). Summary: They fully compute the Chow ring of the stack of planar nodal curves of a given degree. In the appendix, I apply an h-principle to study the cycle class map to cohomology.
• An h-principle for complements of discriminants (ArXiv). Geometry & Topology. Summary: I investigate the homology of spaces of non-singular algebraic sections of vector bundles on smooth complex projective varieties. In a range, the homology is shown to be that of a more tractable object: continuous sections of an associated bundle. This allows computations using the homotopical arsenal. You can see me on YouTube talk about this work during the workshop on configuration spaces at the University of Copenhagen.

Talks

• (10th March 2025) Moduli and Friends II, Online.
• (30th January 2025) Geometry and Topology seminar, Uppsala.
• (9th January 2025) Séminaire de Topologie, LAGA, Paris Nord.
• (8th October 2024) Topology Seminar, Stockholm.
• (21st August 2024) Topology of moduli spaces, Copenhagen.
• (24th April 2024) Oberseminar Topologie, Münster.
• (24th November 2023) Operadic Methods in Geometry, Barcelona.
• (24th October 2023) Conférence du GDR Théorie de l’Homotopie et Applications, Lille.
• (18th October 2023) Differential Geometry and Topology Seminar, Cambridge.
• (24th July 2023) Young Topologists Meeting 2023, Lausanne.
• (28th June 2023) Homotopy Theory in Trondheim, Trondheim.
• (7th April 2023) Séminaire de Topologie, Lille.
• (10th January 2023) Algebra and Geometry Seminar, Stockholm.
• (13th April 2022) Representation Theory / Number Theory Seminar, Utah.
• (17th March 2022) Geometric Structures Research Seminar, SISSA, Trieste.
• (23rd February 2022) Purdue Topology Seminar, Purdue.
• (18th November 2021) Homology and Homotopy of Configuration Spaces, Copenhagen.

Teaching

• Foundations of analysis, 2024 (Bachelor’s course, University of Stockholm) – Teaching assistant.
• Algebraic Geometry 1, 2022-2023 (Master’s course, University of Copenhagen) – Teaching assistant.
• Topics in Mathematics for the Travelling Student, 2022-2023 (in French, University of Copenhagen) – Lecturer. (See the webpage for more.)
• Geometric Topology, 2021-2022 (Master’s course, University of Copenhagen) – Teaching assistant.
• Topics in Mathematics for the Travelling Student, 2021-2022 (in French, University of Copenhagen) – Lecturer.
• Algebraic Topology 1.5, 2020-2021 (Master’s course, University of Copenhagen) – Teaching assistant.
• Algebraic Topology 1, 2020-2021 (Master’s course, University of Copenhagen) – Teaching assistant.
• Topology, 2019-2020 (Bachelor’s course, University of Copenhagen) – Teaching assistant.