Shifted Lagrangian geometry of curves in Radko surfaces
Abstract
We describe the shifted Lagrangian geometry of curves in Radko surfaces, through their global integrations and their homotopy Poisson algebras. We construct the adjoint symplectic groupoid of the surface explicitly, show that admissible curves integrate to embedded Lagrangian subgroupoids, which are 1-shifted Lagrangians, and characterize when their shifted intersections are clean. For a component of the degeneracy locus, a canonical Hamiltonian flow on its shifted self-intersection recovers the modular period. On the infinitesimal side, the homotopy Poisson algebra of a connected admissible curve not contained in the degeneracy locus is L∞-isomorphic to its underlying cochain complex, and its L∞-isomorphism class is determined by the total contact multiplicity. The brackets of arity at least two can be removed by a change of tubular neighbourhood exactly when all contacts are transverse. At tangential contacts, the binary bracket retains the modular vector field. We establish this distinction using a general characterization of the L∞-isomorphisms induced by changes of tubular neighbourhood, valid for arbitrary coisotropic submanifolds.
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BibTeX
@misc{mohamed2026shifted,
title = {{Shifted Lagrangian geometry of curves in Radko surfaces}},
author = {Yassine Ait Mohamed and Maxence Mayrand},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.08248},
eprint = {2611.08248},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.08248},
note = {CC BY-SA 4.0},
}
RIS
TY - UNPB
TI - Shifted Lagrangian geometry of curves in Radko surfaces
AU - Yassine Ait Mohamed
AU - Maxence Mayrand
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.08248
UR - https://arxiv.org/abs/2611.08248
AB - We describe the shifted Lagrangian geometry of curves in Radko surfaces, through their global integrations and their homotopy Poisson algebras. We construct the adjoint symplectic groupoid of the surface explicitly, show that admissible curves integrate to embedded Lagrangian subgroupoids, which are 1-shifted Lagrangians, and characterize when their shifted intersections are clean. For a component of the degeneracy locus, a canonical Hamiltonian flow on its shifted self-intersection recovers the modular period. On the infinitesimal side, the homotopy Poisson algebra of a connected admissible curve not contained in the degeneracy locus is L_∞-isomorphic to its underlying cochain complex, and its L_∞-isomorphism class is determined by the total contact multiplicity. The brackets of arity at least two can be removed by a change of tubular neighbourhood exactly when all contacts are transverse. At tangential contacts, the binary bracket retains the modular vector field. We establish this distinction using a general characterization of the L_∞-isomorphisms induced by changes of tubular neighbourhood, valid for arbitrary coisotropic submanifolds.
ER -