Spectral gaps for stable commutator length via angle structures

Add to your list(s) Download to your calendar using vCal

• Alexis Marchand, IMPAN
• Friday 14 November 2025, 13:45-14:45
• Seminar Room 2, Isaac Newton Institute.

If you have a question about this talk, please contact Macarena Arenas.

Stable commutator length (scl) is a measure of homological complexity of group elements, with connections to many topics in geometric topology, including quasimorphisms, bounded cohomology, and simplicial volume. The goal of this talk is to shed light on some of its relations with non-positive curvature. We will present a geometric method to prove sharp lower bounds for scl, giving a new proof of a theorem of Heuer on the spectral gap of scl in right-angled Artin groups. We will explain the idea of the method and show how it works in the special case of free groups.

This talk is part of the Geometric Group Theory (GGT) Seminar series.

This talk is included in these lists:

• All CMS events
• CMS Events
• DPMMS info aggregator
• Geometric Group Theory (GGT) Seminar
• Hanchen DaDaDash
• Interested Talks
• Seminar Room 2, Isaac Newton Institute
• bld31

Note that ex-directory lists are not shown.