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$\mathrm{GL}_2 \mathbb{R}$–invariant measures in marked strata: generic marked points, Earle–Kra for strata and illumination

Paul Apisa

Geometry & Topology 24 (2020) 373–408
Abstract

We show that nontrivial GL(2, )–invariant point markings for translation surfaces in strata of abelian differentials exist only when the translation surface belongs to a hyperelliptic component. As an application, we establish constraints on sections of the universal curve restricted to orbifold covers of subvarieties of the moduli space of Riemann surfaces that contain a Teichmüller disk. We also solve the finite blocking problem for generic translation surfaces.

Keywords
dynamics on Teichmüller space, flat surfaces, translation surfaces
Mathematical Subject Classification 2010
Primary: 30F60, 32G15, 37F30
References
Publication
Received: 6 September 2018
Revised: 29 March 2019
Accepted: 18 June 2019
Published: 25 March 2020
Proposed: Benson Farb
Seconded: Anna Wienhard, Jean-Pierre Otal
Authors
Paul Apisa
Department of Mathematics
University of Chicago
Chicago, IL
United States
Department of Mathematics
Yale University
New Haven, CT
United States