Generations 2010

Examines trends in the prevalence of various online activities such as blogging and social networking among each generation compared with previous survey findings, with a focus on changes in the gaps between Millennials ages 18-33 and older generations

Neutrino masses from new generations

We reconsider the possibility that Majorana masses for the three known neutrinos are generated radiatively by the presence of a fourth generation and one right-handed neutrino with Yukawa couplings and a Majorana mass term. We find that the observed light neutrino mass hierarchy is not compatible with low energy universality bounds in this minimal scenario, but all present data can be accommodated with five generations and two right-handed neutrinos. Within this framework, we explore the parameter space regions which are currently allowed and could lead to observable effects in neutrinoless double beta decay, $\mu - e$ conversion in nuclei and $\mu \rightarrow e \gamma$ experiments. We also discuss the detection prospects at LHC.Comment: 28 pages, 4 figures. Version to be published. Some typos corrected. Improved figures 3 and

Generations of orthogonal surface coordinates

Two generation methods were developed for three dimensional flows where the computational domain normal to the surface is small. With this restriction the coordinate system requires orthogonality only at the body surface. The first method uses the orthogonal condition in finite-difference form to determine the surface coordinates with the metric coefficients and curvature of the coordinate lines calculated numerically. The second method obtains analytical expressions for the metric coefficients and for the curvature of the coordinate lines

Neutrino Oscillations with Four Generations

Recent status of neutrino oscillation phenomenology with four neutrinos is reviewed. It is emphasized that the so-called (2+2)-scheme as well as the (3+1)-scheme are still consistent with the recent solar and atmospheric neutrino data.Comment: 13 pages, 4 sets of figures, uses sprocl, epsfig. Talk presented at Joint U.S. / Japan Workshop On New Initiatives In Muon Lepton Flavor Violation And Neutrino Oscillation With High Intense Muon And Neutrino Sources, 2-6 Oct 2000, Honolulu, Hawaii, to appear in Proceedings published by World Scientific Publishing C

Four Generations and Higgs Physics

In the light of the LHC, we revisit the implications of a fourth generation of chiral matter. We identify a specific ensemble of particle masses and mixings that are in agreement with all current experimental bounds as well as minimize the contributions to electroweak precision observables. Higgs masses between 115-315 (115-750) GeV are allowed by electroweak precision data at the 68% and 95% CL. Within this parameter space, there are dramatic effects on Higgs phenomenology: production rates are enhanced, weak-boson-fusion channels are suppressed, angular distributions are modified, and Higgs pairs can we observed. We also identify exotic signals, such as Higgs decay to same-sign dileptons. Finally, we estimate the upper bound on the cutoff scale from vacuum stability and triviality.Comment: 11 pages, 7 figures, REVTe

The Shadows of Future Generations

This Note addresses the twin problems of political short-termism and intergenerational equity. Although scholars have discussed these concerns extensively, few scholars have developed proposals to modify democratic institutions-particularly legislatures-to better consider posterity\u27s interests. This Note critiques one such set of proposals by several environmental ethicists for including posterity-oriented legislators in present-generation legislatures. It then proposes a system that ties the long-term outcomes of legislators\u27 policy preferences to their pension plans by creating a new commodities market that values the decisions legislators make and their effect on posterity