3 papers
math.SG2025
Deformations of partially wrapped Fukaya categories of surfaces
Severin Barmeier, Sibylle Schroll, Zhengfang Wang
We give a complete description of the A deformation theory of partially wrapped Fukaya categories of graded surfaces. We show that any abstract A deformation is "…
hep-th2021
Learning scattering amplitudes by heart
Severin Barmeier, Koushik Ray
The canonical forms associated to scattering amplitudes of planar Feynman diagrams are interpreted in terms of masses of projectives, defined as the modulus of their central charge…
math.QA2018
Deformation-obstruction theory for diagrams of algebras and applications to geometry
Severin Barmeier, Yaël Frégier
Let be a smooth complex algebraic variety and let denote its Abelian category of coherent sheaves. By the work of W. Lowen and M. Van den Bergh, it is…