Real-time data on global collaboration networks can support new research and create further connections

Cloud-based technologies provide easier access to the infrastructure and tools needed for research collaboration. The use of these tools can also provide new insights into current collaboration patterns; a picture of what is happening right now rather than what has happened in the past. John Hammersley, reporting on a recent study on research collaboration, considers how this real-time data can be useful in supporting the work of researchers and university libraries. By bringing together communities that form around new cloud-based tools, and local communities that support research within institutions, it is possible to create further connections within both

The bulk from the boundary; holography and AdS/CFT

In this thesis we consider various methods by which one can extract (in detail) the metric structure of asymptotically anti-de Sitter spacetime, using only information from the boundary. This is motivated by the AdS/CFT correspondence, in particular the relation between geometrical properties of the bulk and certain field theory quantities such as "bulk-cone singularities" of two-point functions and entanglement entropy. These CFT quantities are directly related to endpoints of null bulk geodesies and regularised proper area of certain bulk minimal surfaces, respectively. Focussing initially on static, spherically symmetric spacetimes, we demonstrate how the endpoints of null geodesies, and the endpoints (along with the proper length) of zero-energy spacelike geodesies allow us to reconstruct the bulk spacetime metric, and detail explicit iterative algorithms by which the metric functions can be extracted numerically using this data, to an arbitrarily high degree of accuracy. The stability of the methods is demonstrated both via examples, and by an analytic consideration of the errors. Refinements of the algorithms are presented, and we consider the differences in how the two types of geodesic probe the bulk. We focus on a realistic application of our methods, namely extracting the physical properties of a "star" in AdS, which leads to an analysis of how their total mass varies with their core density in higher dimensions. We find the existence of a critical dimension (dc) separating two distinct regimes of behaviour; monotonic for d > d(_e), and oscillatory for d < d(_c). Finally, we consider how our iterative algorithms can be generalised to metrics with less symmetry, and discuss possible directions for future research

A dialogical approach to interdisciplinarity in practice based fine art research

This paper examines An invitation to dialogue Kirkgate Market 2008, as an example of interdisciplinary fine art practice as research and contrasts it against Greckhamer and colleagues’ deconstruction of interdisciplinarity, arguing the former better represents dialogical praxis as a model of interdisciplinarity

Densities for random balanced sampling

A random balanced sample (RBS) is a multivariate distribution with n components X_1,...,X_n, each uniformly distributed on [-1, 1], such that the sum of these components is precisely 0. The corresponding vectors X lie in an (n-1)-dimensional polytope M(n). We present new methods for the construction of such RBS via densities over M(n) and these apply for arbitrary n. While simple densities had been known previously for small values of n (namely 2,3 and 4), for larger n the known distributions with large support were fractal distributions (with fractal dimension asymptotic to n as n approaches infinity). Applications of RBS distributions include sampling with antithetic coupling to reduce variance, and the isolation of nonlinearities. We also show that the previously known densities (for n<5) are in fact the only solutions in a natural and very large class of potential RBS densities. This finding clarifies the need for new methods, such as those presented here.Comment: 20 pages, 6 figures, to appear in Journal of Multivariate Analysi

Collaborative Writing and Publishing with LaTeX: An AuthorCarpentry Lesson

This lesson covers creating scientific papers in LaTeX and Reference Lists in BibTeX, using the online Overleaf platform. Specific skills demonstrated include linking to graphics created in R; citing references in bibliographic management tools such as Mendeley; and synchronizing an online writing project with GitHub

Collaborative Writing and Publishing with LaTeX: An AuthorCarpentry Lesson

This lesson covers creating scientific papers in LaTeX and Reference Lists in BibTeX, using the online Overleaf platform. Specific skills demonstrated include linking to graphics created in R; citing references in bibliographic management tools such as Mendeley; and synchronizing an online writing project with GitHub

Cost accounting at Keswick, England, c. 1598-1615: The German connection

The growing literature on the history of cost and management accounting has left virtually unexplored the developments prior to the British industrial revolution. Recently the business notebooks of Daniel Hechstetter, the German manager of an English copper works from 1597 to 1633, have been transcribed and published, making available what is probably the most detailed set of business records for a British-based industrial enterprise in this period. This paper examines Hechstetter\u27s background and role at Keswick, and translates a sample of the calculations into modern English. These calculations show that a number of modern cost accounting concepts and procedures were in use by c. 1600. The significance of this in relation to our understanding of the development of cost and management accounting is assessed, and it is shown that there is a strong case for claiming that German enterpreneurs involved in this enterprise were responsible for introducing a range of cost accounting techniques to Britain

Extracting the bulk metric from boundary information in asymptotically AdS spacetimes

We use geodesic probes to recover the entire bulk metric in certain asymptotically AdS spacetimes. Given a spectrum of null geodesic endpoints on the boundary, we describe two remarkably simple methods for recovering the bulk information. After examining the issues which affect their application in practice, we highlight a significant advantage one has over the other from a computational point of view, and give some illustrative examples. We go on to consider spacetimes where the methods cannot be used to recover the complete bulk metric, and demonstrate how much information can be recovered in these cases.Comment: 33 pages, 11 figures; v2 references adde