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Huber's theorem for hyperbolic orbisurfaces  [PDF]
Emily B. Dryden,Alexander Strohmaier
Mathematics , 2005, DOI: 10.4153/CMB-2009-008-0
Abstract: We show that for compact orientable hyperbolic orbisurfaces, the Laplace spectrum determines the length spectrum as well as the number of singular points of a given order. The converse also holds, giving a full generalization of Huber's theorem to the setting of compact orientable hyperbolic orbisurfaces.
Bounds for Green's functions on noncompact hyperbolic Riemann orbisurfaces of finite volume  [PDF]
Anilatmaja Aryasomayajula
Mathematics , 2014,
Abstract: In 2006, in a paper published in Compositio titled "Bounds on canonical Green's functions", J. Jorgenson and J. Kramer derived bounds for the canonical Green's function and the hyperbolic Green's function defined on a compact hyperbolic Riemann surface. In this article, we extend these bounds to noncompact hyperbolic Riemann orbisurfaces of finite volume and of genus greater than zero, which can be realized as a quotient space of the action of a Fuchsian subgroup of first kind on the hyperbolic upper half-plane. Our bounds are optimally derived by following the methods from the above mentioned paper of J. Jorgenson and J. Kramer.
A relation of cusp forms and Maass forms on product of hyperbolic Riemann orbisurfaces of finite volume  [PDF]
Anilatmaja Aryasomayajula
Mathematics , 2014,
Abstract: In 2006, in a paper published in Compositio, titled "Bounds on canonical Green's functions", J. Jorgenson and J. Kramer proved a certain key identity which relates the two natural metrics, namely the hyperbolic metric and the canonical metric defined on a compact hyperbolic Riemann surface. In this article, we extend this identity to product of noncompact hyperbolic Riemann orbisurfaces of finite volume, which can be realized as a quotient space of the action of a Fuchsian subgroup of first kind on the hyperbolic upper half plane.
A Bound on Length Isospectral Families of Hyperbolic Surfaces  [PDF]
Weston Ungemach
Mathematics , 2013,
Abstract: In this paper we obtain a bound on the number of isometry classes of finite area hyperbolic surfaces which are length isospectral to a given surface depending only on the topological type of the surface and the length of the shortest closed geodesic on the surface. This will follow from a more general bound applying to any family of hyperbolic surfaces which admits a Bers' constant and with a lower bound on systole length.
On the Residual Finiteness Growths of Particular Hyperbolic Manifold Groups  [PDF]
Priyam Patel
Mathematics , 2014,
Abstract: We give a quantification of residual finiteness for compact hyperbolic 3--manifold and 4--manifold groups that virtually embed in specific right-angled Coxeter groups arising as reflection groups for all right polyhedra in ${\bf H}^3$ and ${\bf H}^4$, respectively. We show for this class of groups that their residual finiteness growths are at most linear in terms of geodesic length.
Vertex finiteness for splittings of relatively hyperbolic groups  [PDF]
Vincent Guirardel,Gilbert Levitt
Mathematics , 2013,
Abstract: Consider a group G and a family $\mathcal{A}$ of subgroups of G. We say that vertex finiteness holds for splittings of G over $\mathcal{A}$ if, up to isomorphism, there are only finitely many possibilities for vertex stabilizers of minimal G-trees with edge stabilizers in $\mathcal{A}$. We show vertex finiteness when G is a toral relatively hyperbolic group and $\mathcal{A}$ is the family of abelian subgroups. We also show vertex finiteness when G is hyperbolic relative to virtually polycyclic subgroups and $\mathcal{A}$ is the family of virtually cyclic subgroups; if moreover G is one-ended, there are only finitely many minimal G-trees with virtually cyclic edge stabilizers, up to automorphisms of G.
Laplace-isospectral hyperbolic 2-orbifolds are representation-equivalent  [PDF]
Peter G. Doyle,Juan Pablo Rossetti
Mathematics , 2011,
Abstract: Using the Selberg trace formula, we show that for a hyperbolic 2-orbifold, the spectrum of the Laplacian acting on functions determines, and is determined by, the following data: the volume; the total length of the mirror boundary; the number of conepoints of each order, counting a mirror corner as half a conepoint; and the number of primitive closed geodesics of each length and orientability class, counting a geodesic running along the boundary as half orientation-preserving and half orientation-reversing, and discounting imprimitive geodesics appropriately. This implies that Laplace-isospectral hyperbolic 2-orbifolds determine equivalent linear representations of Isom(H^2), and are isospectral for any natural operator.
Finiteness of arithmetic hyperbolic reflection groups  [PDF]
Ian Agol,Mikhail Belolipetsky,Peter Storm,Kevin Whyte
Mathematics , 2006,
Abstract: We prove that there are only finitely many conjugacy classes of arithmetic maximal hyperbolic reflection groups.
K-homological finiteness and hyperbolic groups  [PDF]
Heath Emerson,Bogdan Nica
Mathematics , 2013,
Abstract: Motivated by classical facts concerning closed manifolds, we introduce a strong finiteness property in K-homology. We say that a C*-algebra has uniformly summable K-homology if all its K-homology classes can be represented by Fredholm modules which are finitely summable over the same dense subalgebra, and with the same degree of summability. We show that two types of C*-algebras associated to hyperbolic groups - the C*-crossed product for the boundary action, and the reduced group C*-algebra - have uniformly summable K-homology. We provide explicit summability degrees, as well as explicit finitely summable representatives for the K-homology classes.
Isospectral hyperbolic surfaces have matching geodesics  [PDF]
Peter G. Doyle,Juan Pablo Rossetti
Mathematics , 2006,
Abstract: We show that if two closed hyperbolic surfaces (not necessarily orientable or even connected) have the same Laplace spectrum, then for every length they have the same number of orientation-preserving geodesics and the same number of orientation-reversing geodesics. Restricted to orientable surfaces, this result reduces to Huber's theorem of 1959. Appropriately generalized, it extends to hyperbolic 2-orbifolds (possibly disconnected). We give examples showing that it fails for disconnected flat 2-orbifolds.
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