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12 papers · 1 filter
Commensurability and QI classification of free products of finitely generated abelian groups
Jason Behrstock, Tadeusz Januszkiewicz, Walter Neumann
Suppose a group is quasi-isometric to a free product of a finite set of finitely generated abelian groups; let denote the set of ranks of the free abelian parts of the…
Transient and Highly Polarized Double-Peaked H-alpha Emission in the Seyfert 2 Nucleus of NGC 2110
Edward C. Moran, Aaron J. Barth, Michael Eracleous +1
We have discovered an extremely broad, double-peaked H-alpha emission line in the polarized flux spectrum of NGC 2110, establishing that this well-studied Seyfert 2 galaxy contains…
Very high energy observations of the BL Lac objects 3C 66A and OJ 287
T. Lindner, D. S. Hanna, J. Kildea +15
Using the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE), we have observed the BL Lac objects 3C 66A and OJ 287. These are members of the class of low-frequency-peake…
A new twist on Lorenz links
Joan Birman, Ilya Kofman
Twisted torus links are given by twisting a subset of strands on a closed braid representative of a torus link. T--links are a natural generalization, given by repeated positive tw…
Dark Energy and Stabilization of Extra Dimensions
Brian R. Greene, Janna Levin
We discuss the role Casimir energies may play in addressing issues of moduli stabilization and dark energy. In particular, we examine a (non-supersymmetric) brane world scenario wi…
"Hidden" Seyfert 2 Galaxies in the Chandra Deep Field North
Carolin N. Cardamone, Edward C. Moran, Laura E. Kay
We have compared the X-ray--to--optical flux ratios (F_x/F_opt) of absorbed active galactic nuclei (AGNs) in the Chandra Deep Field North (CDF-N) with those of nearby, optically cl…