I study higher structures in geometry and physics. My research mainly involves ideas from (derived) algebraic geometry and (higher) category theory. More precisely, I focus on the following subjects:
Stacky constructions. I am interested in how stacks appear in geometry and physics (e.g., moduli spaces, gauge and functorial field theories). In particular, my Ph.D. thesis presents stacky constructions for specific gravity theories.
Derived geometry. I focus mainly on derived algebraic/symplectic geometry and neighboring subjects. In particular, my postdoc project (at the Uni. of Zurich) introduces shifted contact structures on derived stacks. It examines their possible consequences (e.g., Darboux-type local presentations, the notion of symplectification, the construction of examples and further structures), leading to the development of derived contact geometry. Currently, I work on different aspects of these structures. The results obtained so far can be categorized as:
We refer to the first three corresponding papers as the Foundational Trilogy (2022-2025).
Building upon that trilogy, we have established various new results and applications. I prefer to call this work the EI&KiB-Trilogy (2026). Huge thanks to Efe İzbudak for the enormous impact and dedication.
Further developments are in progress. One project extends symplectic/contact fibrations into the derived setting. This is a joint work with M. F. Arıkan and E. İzbudak. We call this program ABİ's Derived Fibrations Trilogy (2026-2027).
>> A joke: "ABİ" forms a Turkish word and is translated as "Bro", so you may also call us "Derived Fibrations Bros."
>> A follow-up joke: Our catchphrase might then be like: "We don't just lift weights, bro. We lift fibrations. We are the Derived Fibrations Bros."
Other companion papers and projects are in progress.
Stay tuned for more trilogies (fingers crossed) and jokes !!!
Mathematical physics. I am also curious about the constructions and classifications of (un)extended functorial field theories (Topological, Homotopical, Geometrical).
Some keywords: Algebraic/differential geometry, category theory, derived algebraic/symplectic/contact geometry, higher categorical structures, stacks, and mathematical physics (low-dimensional topology and gauge theory; TQFTs and more general functorial field theories; gravity theories and quantization).
Live long and prosper _V/
M. F. Arıkan, E. İzbudak, K. İ. B., Derived Fibrations-II: Shifted Contact Structures on Exact Symplectic Fibrations (2026). arXiv:2609.08617
M. F. Arıkan, E. İzbudak, K. İ. B., Derived Fibrations-I: Shifted Symplectic Fibrations and Derived Thurston Theorem (2026). arXiv:2606.21717 (submitted)
E. İzbudak, K. İ. B., AKSZ Construction for Shifted Contact Structures (2026). arXiv:2606.13866
E. İzbudak, K.İ.B., Derived Legendrian Category for Shifted Contact Stacks (2026). arXiv:2605.13792 (submitted)
E. İzbudak, K. İ. B., Equivariant Quotients of Derived Symplectic Spaces and Legendrian Intersection Theorem (2026), arXiv:2605.08394 (submitted)
K. İ. Berktav, On higher structures in mathematical physics (2026), J. Phys.: Conf. Ser. 3264 012014
K. İ. Berktav, Introduction to derived contact geometry (2025), to appear in the Springer-INdAM volume "Poisson Geometry and Mathematical Physics-II."
K. İ. Berktav, Shifted contact structures Part-III: Legendrian structures in derived geometry (2025), arXiv:2406.17416 (To appear in Istanb. J. Math.)
K. İ. Berktav, Shifted contact structures Part-II: On shifted contact derived Artin stacks (2025), Higher Structures 9 (2): 103-135, 2025. arXiv:2401.03334.
K. İ. Berktav, Stacks in Einstein Gravity, Turk J. of Math. (2024) Vol. 48: No. 4, Article 5.
K. İ. Berktav, Shifted contact structures and their local theory (Part-I), Ann. Fac. Sci. Toulouse, Math., Série 6, Vol. 33 (2024) No. 4, pp. 1019-1057.
The latest version: arXiv:2209.09686 + Addendum (2025).
K. İ. Berktav, Derived Geometric Formulations in Physics, Int. J. Geom. Methods in Mod. Phy. (2022) Vol. 19, No. 10. arXiv:1904.13331,
K. İ. Berktav, F. Özbudak, Euclidean Polynomials for Certain Arithmetic Progressions and the Multiplicative Group of F_p^2, Quaest. Math. 46 (7), 1283-1292, 2023.
K. İ. Berktav, Moduli theory, stacks and 2-Yoneda Lemma (2021), arXiv:2202.06628
K. İ. Berktav, An Introduction to Geometric Quantization and Witten’s Quantum Invariant (2019), arXiv:1902.10813
Recent developments on derived contact geometry (2026), @GitHub
A Mathematical Introduction to Geometric Quantization (2025), with B.Oğuz, Ö. Önder, Y.E. Sargut, B.D. Sevinç, D.N. Taştan. arXiv:2512.03171
Stacks in Mathematical Physics (2024), @ GitHub
"What is DAG?" (2024), @ GitHub.
Notes on Serre's formula (2024), see GitHub
Shifted Geometric Structures (2023), @GitHub