Quantum Mathematical Physics Seminar
2015/2016 | 2016/2017 | 2017/2018 | 2018/2019 | 2019/2020 | 2020/2021 | 2021/2022 | 2022/2023 | 2023/2024 | 2024/2025 | 2025/2026 | 2026/2027
2026-10-20 (Wtorek)
Leszek Hadasz (UJ)
Super Quantum Airy Structures and N=1 super-Virasoro constraints for external source models
The Kontsevich-Witten model provides a cornerstone of mathematical physics, linking topological gravity, intersection theory on the moduli space of stable curves, and matrix model representations of Virasoro constraints. In this talk, we present a unified supercurrent formulation of $\mathcal{N}=1$ super-Virasoro constraints aimed at an external source description for supersymmetric extensions of the Kontsevich model. We introduce a super-Miwa transformation that translates infinite hierarchy times into finite spectral variables, representing projected super energy-momentum tensors as explicit differential operators. We show that cubic dilaton shifts yield standard Super Quantum Airy Structures in the NS--NS and R--NS sectors, whereas the R--R and NS--R sectors require an auxiliary odd coordinate or central constraint to resolve Ramond zero modes. Our central result is an exact similarity transformation in spectral variables that intertwines the NS--NS and R--R differential constraints.
2026-10-13 (Wtorek)
Marcin Napiórkowski (FUW)
Gibbs state of the mean-field Bose gas
We study the homogeneous mean-field Bose gas at temperatures proportional to the critical temperature of its Bose-Einstein condensation phase transition. We establish a trace norm approximation for the grand canonical Gibbs state, providing the first rigorous justification of Lee and Yang's extension of Bogoliubov theory to finite temperatures. This is joint work with A. Deuchert (Virginia Tech) P.T. Nam (LMU Munich).
2026-10-06 (Wtorek)
Rob Klabbers (Humboldt University, Berlin)
Long-range integrability
I will review the basic workings of quantum integrability for spin chains of Heisenberg-type, such as the xxx chain. Such chains are short-range, with only nearest-neighbour interactions. There is a second recipe which produces long-range chains with interactions between all particle pairs, such as the Haldane-Shastry model, in which the integrable structure takes a different form. I will discuss this in details, and motivate why long-range models are interesting from both a physics and a mathematics perspective. Finally, I will present an overview of the chains which interpolate between the short- and long-range regimes and show all the hallmarks of quantum integrability. Working out the underlying theory should unify the two regimes, and allow us to construct integrable models with varying interaction strength.


