Research interest and experience
My main interest is the construction of various geometric structures on in the framework of algebroids. Algebroids are certain vector bundles in which one can generalize the usual notions of differential geometric structures. These new structures naturally appear in string and M theories, where the extended objects enjoy stringy duality symmetries.
In the past, we constructed metric-connection geometries on Leibniz algebroids. For certain special (admissible) connections, we proved many desirable properties including Cartan structure equations, Bianchi identities and the Schouten decomposition. Furthermore, we introduced statistical, conjugate connection and Hessian structures, and proved some analogous results to the ones in the manifold setting. In order to extend a central result in generalized geometry, known as the Severa classification of exact Courant algebroids, we introduced metric-Bourbaki algebroids, where we generalized the Cartan calculus of Lie derivative, exterior derivative and interior product. Later this lead us to a further abstraction, a calculus framework on algebroids, where we introduced the concept of bialgebroids and their Drinfeld doubles, extending Lie bialgebroids and matched pairs of Lie algebroids. Since (Poisson-Lie) T-duality can be captured in the framework of Lie bialgebroids, our framework sustains a useful generalization for U-duality. Furthermore, by including generalizations of the (H- and R-)twists, we also captured the twistful case with the notion of protobialgebroids by extending the proto Lie bialgebroids.
Currently, I am the principal investigator in the TÜBİTAK 3501 project "Stringy Geometries in the Framework of Algebroids". One of the main aims of this project is a better understanding of duality symmetries. Exceptional Drinfeld algebras have been introduced as custom-tailored generalizations of Drinfeld doubles of Lie bialgebras for U-duality. We are able to consider these algebraic objects in our calculus framework in a rigorous manner; and we aim to fully analyze the topic in order to have a closer look on duality symmetries. In the twistful case, we are interested in Jacobi structures, Jacobi-Lie T-plurality and their possible extensions. Second aim of the project is to generalize certain geometric structures to the algebroid setting. In particular, we aim to extend our previous work on admissible connections for finding other special connections for various geometric structures. We plan to focus on conformal, projective and symplectic structures, where for the first two we have some preliminary results. The third goal of the project is to be able to express AKSZ sigma model construction in our calculus framework on algebroids with the hope of translating the AKSZ dictionary to a bosonic language, as we did for protobialgebroids.
Apart from this project, I am interested in frameworks against pointillisme in physics. We are currently reviewing such frameworks where the notion of points do not naturally arise. This ongoing study includes a wide range of physical, mathematical and philosophical topics from various generalizations of geometries to spacetime substantivalism/relationalism debate.
You can find my profiles for Research gate, arXiv, Inspire, ORCID, Linkedin.
Publications
A. Çatal-Özer, K. Doğan, C. Yetişmişoğlu, “Drinfel’d Doubles, Twists, and All That... in Stringy Geometry and M Theory”, Journal of High Energy Physics (2025) arXiv:2409.11973 [hep-th].
A. Çatal-Özer, K. Doğan, C. Yetişmişoğlu, “Drinfel’d Double of Bialgebroids for String and M Theories: Dual Calculus Framework”, Journal of High Energy Physics (2024) arXiv: 2312.06584 [hep-th].
A. Çatal-Özer, T. Dereli, K. Doğan, “Metric-Bourbaki Algebroids: Cartan Calculus for M Theory”, Journal of Geometry and Physics 199 (2024), arXiv: 2210.00548 [math.DG].
T. Dereli, K. Doğan, “Anti-Commutable Pre-Leibniz Algebroids and Admissible Connections”, Journal of Geometry and Physics 186 (2023), arXiv:2108.10199 [math.DG].
K. Doğan, “Statistical Geometry and Hessian Structures on Pre-Leibniz Algebroids”, Journal of Physics: Conference Series 2191, 012011 (2022), arXiv:2109.03916 [math.DG].
T. Dereli, K. Doğan, “Metric-Connection Geometries on Pre-Leibniz Algebroids: A Search for Geometrical Structure in String Models”, Journal of Mathematical Physics 62, 032301 (2021) arXiv:2006.05957.
T. Dereli, K. Doğan, & C. Yetişmişoğlu, “Kaluza-Klein Reduction of the 6 Dimensional Dirac Equation on S^3≅ SU(2) and Non-abelian Topological Insulators” (2019 - unpublished results), arXiv:1904.08146 [math-ph].
K. Doğan, “Fiber Bundles in Classical Field Theories”, Mimar Sinan Fine Arts University, Theoretical Physics Days 2019 Proceedings, (in Turkish).
K. Doğan, A. Mostafazadeh, & M. Sarısaman, “Spectral Singularities, Threshold Gain, and Output Intensity for a Slab Laser with Mirrors”, Annals of Physics 392 (2018), arXiv:1710.02825.
I am also amateurly interested in analytical philosophy, in particular its intersection with ontology, epistemology, and philosophy of physics and mathematics.
I published a semi-academic writing on philosophy in Turkish: K. Doğan, “Scientific Method and Inference to the Best Explanation in Mathematical Physics”, Kualia Analytical Philosophy Magazine, (2021). Moreover, I gave a talk for the same magazine in 2021 titled “Spacetime, Relativity and Geometry” where you can find the video link.
My Erdös number is 4.