Anti-B-B Mixing Constrains Topcolor-Assisted Technicolor

We argue that extended technicolor augmented with topcolor requires that all mixing between the third and the first two quark generations resides in the mixing matrix of left-handed down quarks. Then, the anti-B_d--B_d mixing that occurs in topcolor models constrains the coloron and Z' boson masses to be greater than about 5 TeV. This implies fine tuning of the topcolor couplings to better than 1%.Comment: 9 pages, LaTeX, with one postscript figure. Version to appear in Physics Letters B. Minor typos corrected and note added on top-pion contribution to Z to b b-bar deca

Adaptive Designs for Optimal Observed Fisher Information

Expected Fisher information can be found a priori and as a result its inverse is the primary variance approximation used in the design of experiments. This is in contrast to the common claim that the inverse of observed Fisher information is a better approximation to the variance of the maximum likelihood estimator. Observed Fisher information cannot be known a priori; however, if an experiment is conducted sequentially (in a series of runs) the observed Fisher information from previous runs is available. In the current work two adaptive designs are proposed that use the observed Fisher information from previous runs in the design of the current run.Comment: 19 pages, 2 figure

A completely integrable system on G2G_2 coadjoint orbits

We construct a Gelfand-Zeitlin system on a one-parameter family of $G_2$ coadjoint orbits that are multiplicity-free Hamiltonian $SU(3)$-spaces. Using this system we prove a lower bound for the Gromov width of these orbits. This lower bound agrees with the known upper bound.Comment: 7 pages, 2 figures. Comments are welcome

New Model-Independent Limit on Muon Substructure

If the discrepancy between the theoretical and newly measured values of the muon's anomalous magnetic moment is ascribed to muon substructure, there results an improved model--independent limit on its energy scale, 1.2 TeV < Lambda_mu < 3.2 TeV at 95% C.L.Comment: 3 pages, Latex. Revised version places 95% C.L. limits on muon substructure scale. Abstract is modified to reflect this chang

Voices from the Past: compositional approaches to using recorded speech

This paper investigates some of the ways in which composers and sound artists have used recordings of speech, especially in works mediated by technology. It will consider this within a wider context of spoken word, text composition and performance-based genres such as sound poetry. It will attempt to categorise some of the compositional techniques that may be used to work with speech, make specific reference to archive and oral history material and attempt to draw some conclusions

Fearless Friday: Tiffany Lane

This week, SURGE is highlighting the fearless work of Tiffany Lane, the new director of the Women’s and LGBTQ Resource Center on campus. Although she is a new addition to the Gettysburg community, Tiffany has been working with issues of systemic injustice for much of her life. Her social justice journey began when she was an undergrad at Michigan State University (MSU), where she began to accept her identity as a queer woman. Tiffany was a student leader and activist at MSU and became so passionate about this work that she decided to make a career out of her activism. Tiffany went on to get her masters in social work from the University of Minnesota. Prior to arriving on our campus, Tiffany was the director of an LGBT center, the program coordinator of an LGBT school-based program, and a program coordinator at the University of Michigan-Flint. [excerpt

A Case Study in Dimensional Deconstruction

We test Arkani-Hamed et al.'s dimensional deconstruction on a model that is predicted to have a naturally light composite Higgs boson, i.e., one whose mass M is much less than its binding scale \Lambda, and whose quartic coupling \lambda is large, so that its vacuum expectation value v \sim M/\sqrt{\lambda} << \Lambda also. We consider two different underlying dynamics--UV completions--at the scale \Lambda for this model. We find that the expectation from dimensional deconstruction is not realized and that low energy details depend crucially on the UV completion. In one case, M << \Lambda and \lambda << 1, hence, v \sim \Lambda. In the other, \lambda can be large or small, but then so is M, and v is still O(\Lambda).Comment: 20 pages, LaTeX, with 8 postscript figure