The Microwave Background Bispectrum, Paper I: Basic Formalism

In this paper, we discuss the potential importance of measuring the CMB anisotropy bispectrum. We develop a formalism for computing the bispectrum and for measuring it from microwave background maps. As an example, we compute the bispectrum resulting from the 2nd order Rees-Sciama effect, and find that is undetectable with current and upcoming missions.Comment: 18 Pages, 3 Postscript Figures; Minor changes in response to referee's repor

[Review of] Richard E. Meyer, ed. Cemeteries and Gravemarkers: Voices of American Culture

The twelve individual essays contained in this volume were originally presented as papers in the Cemeteries and Gravestones Section at a conference of the American Culture Association. A short foreword by James Deetz, an early leader in the anthropological study of New England cemeteries from the colonial period, provides some instructive initial insights into the wealth of cultural information which can be derived from the study of mortuary behavior in the United States. Meyer\u27s thoughtful introduction and his topical bibliography, though not exhaustive, will be of considerable utility for those wishing to pursue the research topic further. An index along with numerous photographs and other illustrative material additionally enhance this volume

Transitive bi-Lipschitz group actions and bi-Lipschitz parameterizations

We prove that Ahlfors 2-regular quasisymmetric images of the Euclidean plane are bi-Lipschitz images of the plane if and only if they are uniformly bi-Lipschitz homogeneous with respect to a group. We also prove that certain geodesic spaces are bi-Lipschitz images of Carnot groups if they are inversion invariant bi-Lipschitz homogeneous with respect to a group.Comment: To appear in the Indiana University Mathematics Journa