Twisting 2-cocycles for the construction of new non-standard quantum groups

We introduce a new class of 2-cocycles defined explicitly on the generators of certain multiparameter standard quantum groups. These allow us, through the process of twisting the familiar standard quantum groups, to generate new as well as previously known examples of non-standard quantum groups. In particular we are able to construct generalisations of both the Cremmer-Gervais deformation of SL(3) and the so called esoteric quantum groups of Fronsdal and Galindo in an explicit and straightforward manner.Comment: 21 pages, AMSLaTeX, expanded introduction and a few other minor corrections, to appear in JM

Quantum simulation of multiple-exciton generation in a nanocrystal by a single photon

We have shown theoretically that efficient multiple exciton generation (MEG) by a single photon can be observed in small nanocrystals (NCs). Our quantum simulations that include hundreds of thousands of exciton and multi-exciton states demonstrate that the complex time-dependent dynamics of these states in a closed electronic system yields a saturated MEG effect on a picosecond timescale. Including phonon relaxation confirms that efficient MEG requires the exciton--biexciton coupling time to be faster than exciton relaxation time

The Relationship Between Summer Camp Employment and Emotional Intelligence

Camping professionals have long claimed that summer camp employment provides camp staff with a number of benefits. The summer camp staff experience has been shown to have a positive effect on the staff members\u27 personal, social and emotional growth (Bialeschki, Henderson, & Dahowski, 1998; DeGraff & Glover, 2002). Yet, some influentia. others such as parents and human resources professionals have questioned the wisdom of a college student spending a summer of fun in the sun , working at a summer camp for low pay. The concept of emotional intelligence has been recently gaining favor in the human resource management arena, and it may be a:fruitful concept to apply to the potential benefit of summer camp employment. Emotional intelligence refers to a \u27type of·social intelligence that involves the ability to monitor one\u27s own and others\u27 emotions, to discriminate among them, and to use the information to guide one\u27s thinking and actions (Mayer & Salovey, 1993, p. 433). The purpose of this study was to identify how the summer camp experience impacts staff members and to better understand if emotional intelligence is developed through summer camp employment

A Mixed-Method Investigation of the Solo in a Wilderness Experience Program

The purpose of this study was to investigate the participants\u27 perceptions of an organized solo within a wilderness experience program and the influence that the participants themselves and the environment have on their perception. The literature suggests that many factors influence one\u27s ability to experience wilderness solitude and to engage in meaningful reflection that may lead to personal growth (Daniel, 2003; Fredrickson & Anderson, 1999; Hammitt,1982; Hendee & Brown, 1988; Koch, 1994; McIntosh, 1989; Norris, 2001; Richley, 1992; Stringer & McAvoy, 1992). Two of these factors can be categorized as the participant(s) and the environment; both are considered key program characteristics within the adventure education literature (McKenzie, 2000)

Brane Localization and Stabilization via Regional Physics

Extra-dimensional scenarios have become widespread among particle and gravitational theories of physics to address several outstanding problems, including cosmic acceleration, the weak hierarchy problem, and the quantization of gravity. In general, the topology and geometry of the full spacetime manifold will be non-trivial, even if our ordinary dimensions have the topology of their covering space. Most compact manifolds are inhomogeneous, even if they admit a homogeneous geometry, and it will be physically relevant where in the extra-dimensions one is located. In this letter, we explore the use of both local and global effects in a braneworld scenario to naturally provide position-dependent forces that determine and stabilize the location of a single brane. For illustrative purposes, we consider the 2-dimensional hyperbolic horn and the Euclidean cone as toy models of the extra-dimensional manifold, and add a brane wrapped around one of the two spatial dimensions. We calculate the total energy due to brane tension and bending (extrinsic curvature) as well as that due to the Casimir energy of a bulk scalar satisfying a Dirchlet boundary condition on the brane. From the competition of at least two of these effects there can exist a stable minimum of the effective potential for the brane location. However, on more generic spaces (on which more symmetries are broken) any one of these effects may be sufficient to stabilize the brane. We discuss this as an example of physics that is neither local nor global, but regional.Comment: 4 pages, 2 figures. PRL submitte

Cosmicflows-2: The Data

Cosmicflows-2 is a compilation of distances and peculiar velocities for over 8000 galaxies. Numerically the largest contributions come from the luminosity-linewidth correlation for spirals, the TFR, and the related Fundamental Plane relation for E/S0 systems, but over 1000 distances are contributed by methods that provide more accurate individual distances: Cepheid, Tip of the Red Giant Branch, Surface Brightness Fluctuation, SNIa, and several miscellaneous but accurate procedures. Our collaboration is making important contributions to two of these inputs: Tip of the Red Giant Branch and TFR. A large body of new distance material is presented. In addition, an effort is made to assure that all the contributions, our own and those from the literature, are on the same scale. Overall, the distances are found to be compatible with a Hubble Constant H_0 = 74.4 +-3.0 km/s/Mpc. The great interest going forward with this data set will be with velocity field studies. Cosmicflows-2 is characterized by a great density and high accuracy of distance measures locally, falling to sparse and coarse sampling extending to z=0.1.Comment: To be published in Astronomical Journal. Two extensive tables to be available on-line. Table 1 available at http://edd.ifa.hawaii.edu select catalog `Cosmicflows-2 Distances