Arithmetic cusp shapes are dense

Abstract

In this article we verify an orbifold version of a conjecture of Nimershiem from 1998. Namely, for every flat $n$-manifold $M$, we show that the set of similarity classes of flat metrics on $M$ which occur as a cusp cross-section of a hyperbolic $(n+1)$-orbifold is dense in the space of similarity classes of flat metrics on $M$. The set used for density is precisely the set of those classes which arise in arithmetic orbifolds.

Revised after referee report. 11 pages. To appear in Geom. Dedicata

References in corpus (1)

• Cusps of arithmetic orbifolds