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5 papers · 1 filter
The Integral Cohomology of the Bianchi Groups
Ethan Berkove
We calculate the integral cohomology ring structure for various members of the Bianchi group family. The main tools we use are the Bockstein spectral sequence and a long exact sequ…
Farrell cohomology of low genus pure mapping class groups with punctures
Qin Lu
In this paper, we calculate the p-torsion of the Farrell cohomology for low genus pure mapping class groups with punctures, where p is an odd prime. Here, `low genus' means g=1,2,3…
High Velocity Cloud Edges and Mini-HVCs
G. L. Hoffman, E. E. Salpeter, M. G. Pocceschi
Arecibo mapping is reported of the neutral hydrogen distribution along selected directions out from the centers of two small High Velocity Clouds (HVC), W486 and W491. Both HVCs ha…
Bestvina's normal form complex and the homology of Garside groups
Ruth Charney, John Meier, Kim Whittlesey
A Garside group is a group admitting a finite lattice generating set D. Using techniques developed by Bestvina for Artin groups of finite type, we construct K(π,1)s for Garside gro…
X-ray Spectra and Pulse Frequency Changes in SAX J2103.5+4545
A. Baykal, M. J. Stark, J. H. Swank
The November 1999 outburst of the transient pulsar SAX J2103.5+4545 was monitored with the large area detectors of the Rossi X-Ray Timing Explorer until the pulsar faded after a ye…