Marginal deformations of 3d N=2\mathcal{N}=2 CFTs from AdS4_4 backgrounds in generalised geometry

We study exactly marginal deformations of 3d $\mathcal{N}=2$ CFTs dual to AdS$_4$ solutions in eleven-dimensional supergravity using generalised geometry. Focussing on Sasaki-Einstein backgrounds, we find that marginal deformations correspond to turning on a four-form flux on the internal space at first order. Viewing this as the deformation of a generalised structure, we derive a general expression for the four-form flux in terms of a holomorphic function. We discuss the explicit examples of S$^7$, Q$^{1,1,1}$ and M$^{1,1,1}$ and, using an obstruction analysis, find the conditions for the first-order deformations to extend all orders, thus identifying which marginal deformations are exactly marginal. We also show how the all-orders $\gamma$-deformation of Lunin and Maldacena can be encoded as a tri-vector deformation in generalised geometry and outline how to recover the supergravity solution from the generalised metric.Comment: 37 pages; references added in v

Introduction: Layered Landscapes

This Special Issue of Arts investigates a series of creative projects focused upon and sited within certain peripheral landscapes of northern Britain ..

The Lay Summary in Medical Research Proposals - is it becoming more important?

One of the skills every researcher must learn is how to present complex ideas and medical or scientific terms to a “lay” audience, for example members of the public, carers, long-term users of services, organisations representing consumers’ interests, members of the public who are the potential receipients of health promotion programmes or those from a different clinical or academic background to their own. This poster will examine: 1. What is a lay summary? A brief summary of a research project or a research proposal ... written for a lay audience , rather than researchers or professionals ... written in plain English ... avoiding the use of jargon ... explaining any technical terms. 2. The three purposes of a lay summary: • Grant and Ethical review, in particular to ensure a project is accessible by laypersons who are becoming more involved in the peer review process in some funders e.g. National Institute for Health Research – Research for Patient Benefit scheme • Public understanding of science, particularly important for fundraising charities • Raising and justifying funds from government for science to underpin improvements in healthcare 3. What should a lay summary contain? The role of the lay summary is changing, and for many funders it is clearly becoming more important, for example the Arthritis Research Campaign are putting projects to a lay audience for assessment before scientific peer review

Unravelling mysteries of the great learning divide : barriers to learning : a thesis presented in partial fulfillment of the requirements for the degree of Master of Education in Adult Education at Massey University, Palmerston North, New Zealand

This thesis was motivated by a personal determination to alter my own beliefs about what I, as a learner, was capable of achieving and, in the process, unravel some of the mysteries surrounding students who leave school with low, or no, educational attainment. My own limited school achievements, and subsequent success as an adult learner, have led me to question the appropriateness and relevance of our formal learning and teaching systems, particularly at school, but also in the adult sector. By looking deeply into the human mechanisms of learning and other influential factors I began to understand why my school experience had been so inadequate and gained some insight into why it is that our school learning systems are destined to fail a great number of its students. My investigation aimed to identify why some of us appear to fail to discover our learning potential whilst others around us seem to excel. How is it that so many young people (approximately 40%) leave their schooling without gaining even the most basic skills required to enable them to manage many of the critical applications of living? Is this a reflection of ability, or does this indicate something else? What blocks or barriers have these individuals met/faced? What limitations have been imposed or imagined? How can the educators support the kind of education that enables all children grow into complete and fulfilled adults able to contribute something (positive) to their society? Looking at Adult Learning Theories what strikes me is how these theories seem so perfectly applicable across all learning and teaching situations. They are not 'rocket science', as the saying goes, but perfectly logical and reasonable assumptions about the needs, motivations and goals of the majority of learners. Why are they not more widely employed? Memories of my own secondary school learning suggest that these theories have not been a feature of our formal school systems. Had they been I believe some of us might have achieved different outcomes

Water utility of the future: a case study of conservation as a service

INTRODUCTION: Water utilities serving growing populations in dry climates face challenges in balancing increasing water demand with scarce supplies. New water supply sources are increasingly expensive and require construction of additional infrastructure for treatment and delivery. This poses a challenge for utilities to balance revenues and costs to remain financially viable. As a result, water utilities may face a difficult choice. If the utility chooses to develop new water supplies, they will have to increase their rates. However, they can also choose to assess alternative supply and demand management strategies to match revenues with the increasing marginal costs. Approaches such as water reuse, rainwater or condensate harvesting or harnessing other alternative sources are becoming increasingly widespread. Nonetheless, it is important to continuously assess and implement demand conservation programs, which often prove relatively quick, low-cost and straightforward to implement. [TRUNCATED

A radiocarbon database for Scottish archaeological samples

For the majority of dating laboratories and their respective user communities, the journal Radiocarbon is no longer regarded as the medium for primary publication of radiocarbon measurements. In compliance with editorial policy, the emphasis has long since moved towards the publication of research papers on technological enhancements and applications of C-14 as well as other cosmogenic isotopes and this has left a requirement for an alternative medium for the publication of date lists per se.In the late 1980s, an International Radiocarbon Data Base was proposed by Renee Kra (then the managing editor) but limitations in computer and communications technologies together with the inevitable financial implications meant that this timely concept could not be taken to completion. In the last year, we have taken advantage of the development of the worldwide web to compile a database of C-14 age measurements of a Scottish archaeological nature which can be found at the web address http://www.historic-scotland.gov.uk/

Deriving Quests from Open World Mechanics

Open world games present players with more freedom than games with linear progression structures. However, without clearly-defined objectives, they often leave players without a sense of purpose. Most of the time, quests and objectives are hand-authored and overlaid atop an open world's mechanics. But what if they could be generated organically from the gameplay itself? The goal of our project was to develop a model of the mechanics in Minecraft that could be used to determine the ideal placement of objectives in an open world setting. We formalized the game logic of Minecraft in terms of logical rules that can be manipulated in two ways: they may be executed to generate graphs representative of the player experience when playing an open world game with little developer direction; and they may be statically analyzed to determine dependency orderings, feedback loops, and bottlenecks. These analyses may then be used to place achievements on gameplay actions algorithmically.Comment: To appear at Foundations of Digital Games (FDG) 201

The exceptional generalised geometry of supersymmetric AdS flux backgrounds

We analyse generic AdS flux backgrounds preserving eight supercharges in $D=4$ and $D=5$ dimensions using exceptional generalised geometry. We show that they are described by a pair of globally defined, generalised structures, identical to those that appear for flat flux backgrounds but with different integrability conditions. We give a number of explicit examples of such "exceptional Sasaki-Einstein" backgrounds in type IIB supergravity and M-theory. In particular, we give the complete analysis of the generic AdS$_5$ M-theory backgrounds. We also briefly discuss the structure of the moduli space of solutions. In all cases, one structure defines a "generalised Reeb vector" that generates a Killing symmetry of the background corresponding to the R-symmetry of the dual field theory, and in addition encodes the generic contact structures that appear in the $D=4$ M-theory and $D=5$ type IIB cases. Finally, we investigate the relation between generalised structures and quantities in the dual field theory, showing that the central charge and R-charge of BPS wrapped-brane states are both encoded by the generalised Reeb vector, as well as discussing how volume minimisation (the dual of $a$- and $\mathcal{F}$-maximisation) is encoded.Comment: 40 page