Enhancement of Dark Matter Annihilation via Breit-Wigner Resonance

The Breit-Wigner enhancement of the thermally averaged annihilation cross section is shown to provide a large boost factor when the dark matter annihilation process nears a narrow resonance. We explicitly demonstrate the evolution behavior of the Breit-Wigner enhanced as the function of universe temperature for both the physical and unphysical pole cases. It is found that both of the cases can lead an enough large boost factor to explain the recent PAMELA, ATIC and PPB-BETS anomalies. We also calculate the coupling of annihilation process, which is useful for an appropriate model building to give the desired dark matter relic density.Comment: 4 pages, 4 figures, references added, accepted for publication in Physical Review

Using Technology to Facilitate Pre‐Acquisition Workflows for Electronic Resources

Investigation of new e‐resource requests before a purchase decision is made can be very complex, potentially involving gathering information from various parties (publishers/vendors, library stakeholders), setting up a trial, gathering trial feedback, and making sure stakeholders are notified in a timely manner throughout of the investigation process. The University of Nevada, Reno Libraries approached this management challenge by creating a dynamic online form. With its front end originated in InfoPath and its backend database and workflow controlled in SharePoint, this form allows an automated process covering request submission, product evaluation, collection development review, and selection decision. All the information regarding a specific request is gathered into this form, with automated email notifications to stakeholders at each major step of the process. The front end of the form is designed to be very simple and user‐friendly, requiring only three pieces of information from liaison librarians: purchase request title, reason for request, and college with interest. Since the form was launched in July 2015, 100 requests have been submitted. This new form has saved a lot of staff time in managing and communicating about e‐journal/e‐resource requests, which translates to improved services for liaison librarians and library users

The Effects on SS, TT, and UU from Higher-Dimensional Fermion Representations

Inspired by a new class of walking technicolor models recently proposed using higher-dimensional technifermions, we consider the oblique corrections from heavy non-degenerate fermions with two classes of higher-dimensional representations of the electroweak gauge group itself. One is chiral SM-like, and the other is vector-like. In both cases, we obtain explicit expressions for $S$, $T$, $U$ in terms of the fermion masses. We find that to keep the $T$ parameter ultraviolet-finite there must be a stringent constraint on the mass non-degeneracy of a heavy fermion multiplet.Comment: 4 page

Point trajectory planning of flexible redundant robot manipulators using genetic algorithms

The paper focuses on the problem of point-to-point trajectory planning for flexible redundant robot manipulators (FRM) in joint space. Compared with irredundant flexible manipulators, a FRM possesses additional possibilities during point-to-point trajectory planning due to its kinematics redundancy. A trajectory planning method to minimize vibration and/or executing time of a point-to-point motion is presented for FRMs based on Genetic Algorithms (GAs). Kinematics redundancy is integrated into the presented method as planning variables. Quadrinomial and quintic polynomial are used to describe the segments that connect the initial, intermediate, and final points in joint space. The trajectory planning of FRM is formulated as a problem of optimization with constraints. A planar FRM with three flexible links is used in simulation. Case studies show that the method is applicable