Accelerating Taub-NUT and Eguchi-Hanson solitons in four dimensions

We construct new solutions of the vacuum Einstein field equations in four dimensions via a solution generating method utilizing the SL(2,R) symmetry of the reduced Lagrangian. We apply the method to an accelerating version of the Zipoy-Voorhees solution and generate new solutions which we interpret to be the accelerating versions of the Zipoy-Voorhees generalisation of the Taub-NUT solution (with Lorentzian signature) and the Zipoy-Voorhees generalisation of the Eguchi-Hanson solitons (with Euclidean signature). As an intermediary in the solution-generating process we obtain charged versions of the accelerated Zipoy-Voorhees-like families of solutions. Finally we present the accelerating version of the Taub-NUT solution and discuss its properties.Comment: 16 page

Leading change from different shores: The challenges of contextualizing the Scholarship of Teaching and Learning

This article offers narratives of individual journeys through the scholarship of leading in three different contexts—Asia, Europe, and Africa. Together, these narratives argue for the need to make explicit the diversity of practices of the scholarship of teaching and learning (SoTL), with each practice inextricably tied to specific geographical, sociocultural, and political contexts. In offering these contextual specificities, we call on all who engage in SoTL to exercise reflexivity in thought, language, and action—to actively foreground our mental models and assumptions about SoTL and what it looks like for ourselves and for others; to sensitively engage scholars who do not share our context; and to strive toward an inclusive mindset and practice that will situate all of us within the “international” of an international organization. We highlight the problems of language, meaning, and translation; and the challenge scholars from “different shores” face in engaging with “other” shores.&nbsp

Charging Black Saturn?

We construct new charged static solutions of the Einstein-Maxwell field equations in five dimensions via a solution generation technique utilizing the symmetries of the reduced Lagrangian. By applying our method on the multi-Reissner-Nordstrom solution in four dimensions, we generate the multi-Reissner-Nordstrom solution in five dimensions. We focus on the five-dimensional solution describing a pair of charged black objects with general masses and electric charges. This solution includes the double Reissner-Nordstrom solution as well as the charged version of the five-dimensional static black Saturn. However, all the black Saturn configurations that we could find present either a conical singularity or a naked singularity. We also obtain a non-extremal configuration of charged black strings that reduces in the extremal limit to a Majumdar-Papapetrou like solution in five dimensions.Comment: 27 pages, 3 figures, v.3 added more references, corrected typo

Black diholes revisited

Master'sMASTER OF SCIENC

Interaction of light with a single atom in the strong focusing regime

We consider the near-resonant interaction between a single atom and a focused light mode, where a single atom localized at the focus of a lens can scatter a significant fraction of light. Complementary to previous experiments on extinction and phase shift effects of a single atom, we report here on the measurement of coherently backscattered light. The strength of the observed effect suggests combining strong focusing with the well-established methods of cavity QED. We consider theoretically a nearly concentric cavity, which should allow for a strongly focused optical mode. Simple estimates show that in a such case one can expect a significant single photon Rabi frequency. This opens new perspectives and a possibility to scale up the system consisting of many atom+cavity nodes for quantum networking due to a significant technical simplification of the atom--light interfaces.Comment: 7 pages, 6 figures, followup of workshop "Single photon technologies" in Boulder, CO, 200

Leading change from different shores : The challenges of contextualizing the Scholarship of Teaching and Learning

This article offers narratives of individual journeys through the scholarship of leading in three different contexts—Asia, Europe, and Africa. Together, these narratives argue for the need to make explicit the diversity of practices of the scholarship of teaching and learning (SoTL), with each practice inextricably tied to specific geographical, sociocultural, and political contexts. In offering these contextual specificities, we call on all who engage in SoTL to exercise reflexivity in thought, language, and action—to actively foreground our mental models and assumptions about SoTL and what it looks like for ourselves and for others; to sensitively engage scholars who do not share our context; and to strive toward an inclusive mindset and practice that will situate all of us within the “international” of an international organization. We highlight the problems of language, meaning, and translation; and the challenge scholars from “different shores” face in engaging with “other” shores