Modulus of elementary domains in the hyperbolic plane

Abstract

We study the modulus of curve families inside elementary domains in the hyperbolic plane $\bH^1_\C$. We establish exact expressions for the modulus of connecting and separating curve families in a hyperbolic circular annulus. For the symmetric hyperbolic quadrilateral $Q(a,b)$, we obtain lower bounds by restricting the curve families to particular foliations, and upper bounds by constructing admissible densities. These estimates bracket the modulus. We also present numerical evidence showing how close the bounds are, how they behave asymptotically, and we evaluate them for specific values of $(a,b)$.

18 pages, 2 figures, complete rewriting of the previous version at some parts