I am working on physical mathematics and always happy to chat about math and physics, feel free to contact me! I am currently a visiting researcher at IHES.
email: julmer [at] ihes [dot] fr
I did my PhD in Paris, in the Laboratoire LAGA. I defended my PhD on the 9th of January 2026, supervised by Grégory Ginot and Owen Gwilliam. Below is the thesis, entitled “Open-Closed String Field Theory from Calabi-Yau Categories and its Applications to Enumerative Geometry".
thesis_ulmer_jakob.pdfMy research lies at the intersection of enumerative geometry, string (field) theory and homotopical algebra. A larger goal is to provide categorical methods which relate enumerative geometry (as in mirror symmetry) and large N gauge theories.
Some keywords/ pursuits: Kontsevich Matrix Model, Categorical (open-closed) Enumerative-Invariants, Open-Closed Dualities.
Further Interests: Twisted Holography, Gopakumar-Vafa Duality, Homotopical Algebra, Derived Geometry.
I completed my master studies in mathematics at ETH Zürich with a thesis on 'the A-model as a TQFT via Floer Theory' supervised by Pavel Safronov. For my undergraduate studies in physics I was at Universität Heidelberg with a thesis on understading the formalism of Factorization Algebras in QFT supervised by Johannes Walcher.
My PhD was funded by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 945322 through the Fondation Sciences Mathématiques de Paris.