Hierarchically Hyperbolic Surface-by-surface Groups

@misc{dowdall2026hierarchically,
  title = {{Hierarchically Hyperbolic Surface-by-surface Groups}},
  author = {Spencer Dowdall and Matthew Gentry Durham and Chris Leininger and Jacob Russell and Alessandro Sisto},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.40240},
  eprint = {2609.40240},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.40240},
}

TY  - UNPB
TI  - Hierarchically Hyperbolic Surface-by-surface Groups
AU  - Spencer Dowdall
AU  - Matthew Gentry Durham
AU  - Chris Leininger
AU  - Jacob Russell
AU  - Alessandro Sisto
PY  - 2026
DA  - 2026/09/30
PB  - arXiv
DO  - 10.48550/arxiv.2609.40240
UR  - https://arxiv.org/abs/2609.40240
AB  - We give many examples of surface bundles over surfaces whose fundamental groups are hierarchically hyperbolic by showing that extensions of surface groups constructed by the third author and Reid (LR surface groups) are hierarchically hyperbolic. This is facilitated by a new combination theorem for bundles of hyperbolic graphs over a hyperbolic base. This result differs from previous combination theorems for graph bundles by being applicable to bundles where the fibers are not properly embedded. We apply our combination theorem to establish the hyperbolicity of certain graph bundles that arise naturally from extensions of parabolically geometrically finite (PGF) subgroups of mapping class groups. These subgroups include LR surface groups, finitely generated Veech groups, free products of multi-twist groups, and many other examples created by a theorem of Udall. When the PGF groups have cyclic peripherals, hyperbolicity of our graph bundle is the key milestone towards showing that the extension groups are hierarchically hyperbolic.
ER  -