Asymptotically Schroedinger Space-Times: TsT Transformations and Thermodynamics

We study the complete class of 5-dimensional asymptotically Schroedinger space-times that can be obtained as the TsT transform of a 5-dimensional asymptotically AdS space-time. Based on this we identify a conformal class of Schroedinger boundaries. We use a Fefferman-Graham type expansion to study the on-shell action for this class of asymptotically Schroedinger space-times and we show that its value is TsT invariant. In the second part we focus on black hole space-times and prove that black hole thermodynamics is also TsT invariant. We use this knowledge to argue that thermal global Schroedinger space-time at finite chemical potential undergoes a Hawking-Page type phase transition.Comment: References adde

Particle Number and 3D Schroedinger Holography

We define a class of space-times that we call asymptotically locally Schroedinger space-times. We consider these space-times in 3 dimensions, in which case they are also known as null warped AdS. The boundary conditions are formulated in terms of a specific frame field decomposition of the metric which contains two parts: an asymptotically locally AdS metric and a product of a lightlike frame field with itself. Asymptotically we say that the lightlike frame field is proportional to the particle number generator N regardless of whether N is an asymptotic Killing vector or not. We consider 3-dimensional AlSch space-times that are solutions of the massive vector model. We show that there is no universal Fefferman-Graham (FG) type expansion for the most general solution to the equations of motion. We show that this is intimately connected with the special role played by particle number. Fefferman-Graham type expansions are recovered if we supplement the equations of motion with suitably chosen constraints. We consider three examples. 1). The massive vector field is null everywhere. The solution in this case is exact as the FG series terminates and has N as a null Killing vector. 2). N is a Killing vector (but not necessarily null). 3). N is null everywhere (but not necessarily Killing). The latter case contains the first examples of solutions that break particle number, either on the boundary directly or only in the bulk. Finally, we comment on the implications for the problem of holographic renormalization for asymptotically locally Schroedinger space-times.Comment: 56 pages, v3: matches version published in JHE

Preparing MIS Students for a Global Economy

Most Management Information Systems (MIS) careers in the future are likely to involve systems that operate internationally. Systems will be globally integrated, and many of today\u27s students will have opportunities to participate in projects in other countries. Even those who remain in one country throughout their careers, however, will need to be aware of the differences in language and culture between areas of the world. The MIS curriculum is already overcrowded, so it is difficult for developers to include sufficient international content. This paper describes some techniques for embedding international content within existing courses in contrast to treating international information systems as a separate topic

Information Systems Research: Reversing the Orientation

To be truly relevant, research must be oriented toward the future. After the research is completed, it must ultimately provide some value to society, whether near term or long term. Information systems researchers, concerned as we are with the uses of technology, operate under a severe handicap because we do not have opportunities to study new technologies while they are under development. Our challenge is to find ways to work together on the most relevant questions and to perform research at earlier stages of the technology life cycle

Etude des peintures murales romanes dans les anciens territoires de Bourgogne : de Berzé-la-Ville à Rome et d’Auxerre à Compostelle

Le corpus des peintures murales romanes des anciens territoires de Bourgogne comprend vingt-cinq sites, situés dans une vaste aire géographique allant d’Auxerre à Bâle pour la limite nord, et de Nevers à la Provence pour la partie méridionale. Dans un premier temps, nous évoquerons l’état des recherches concernant la Chapelle-des-Moines de Berzé-la-Ville (iconographie, style, technique). Dans un second temps, nous présenterons rapidement quelques peintures influencées par l’ouest de la France, tandis que la troisième partie traitera de peintures de style hispanisant. Enfin nous terminerons par la présentation de l’état de conservation de certains sites.National audienceLe corpus des peintures murales romanes des anciens territoires de Bourgogne comprend vingt-cinq sites, situés dans une vaste aire géographique allant d’Auxerre à Bâle pour la limite nord, et de Nevers à la Provence pour la partie méridionale. Dans un premier temps, nous évoquerons l’état des recherches concernant la Chapelle-des-Moines de Berzé-la-Ville (iconographie, style, technique). Dans un second temps, nous présenterons rapidement quelques peintures influencées par l’ouest de la France, tandis que la troisième partie traitera de peintures de style hispanisant. Enfin nous terminerons par la présentation de l’état de conservation de certains sites

Torsional Newton-Cartan Geometry and Lifshitz Holography

We obtain the Lifshitz UV completion in a specific model for z=2 Lifshitz geometries. We use a vielbein formalism which enables identification of all the sources as leading components of well-chosen bulk fields. We show that the geometry induced from the bulk onto the boundary is a novel extension of Newton-Cartan geometry with a specific torsion tensor. We explicitly compute all the vevs including the boundary stress-energy tensor and their Ward identities. After using local symmetries/Ward identities the system exhibits 6+6 sources and vevs. The FG expansion exhibits, however, an additional free function which is related to an irrelevant operator whose source has been turned off. We show that this is related to a second UV completion.Comment: v2: 5 pages, matches version published in PR

Quantum automorphism groups of connected locally finite graphs and quantizations of discrete groups

We construct for every connected locally finite graph $\Pi$ the quantum automorphism group $\text{QAut}\ \Pi$ as a locally compact quantum group. When $\Pi$ is vertex transitive, we associate to $\Pi$ a new unitary tensor category $\mathcal{C}(\Pi)$ and this is our main tool to construct the Haar functionals on $\text{QAut}\ \Pi$. When $\Pi$ is the Cayley graph of a finitely generated group, this unitary tensor category is the representation category of a compact quantum group whose discrete dual can be viewed as a canonical quantization of the underlying discrete group. We introduce several equivalent definitions of quantum isomorphism of connected locally finite graphs $\Pi$, $\Pi'$ and prove that this implies monoidal equivalence of $\text{QAut}\ \Pi$ and $\text{QAut}\ \Pi'$.Comment: v3: final version to appear in International Mathematics Research Notices. In this final version v3, there are several small changes and also the new proposition 3.4 providing a connection to the quantum isometry groups of arXiv:1002.255

Le Child Coaching et les difficultés comportementales en classe régulière :: nouvelle méthode pour les enseignants démunis ?

Ce travail de mémoire s’intéresse aux comportements difficiles manifestés en classe régulière. La recherche compare deux méthodes disciplinaires différentes amenées dans une classe de 7ème Harmos dans laquelle plusieurs enfants manifestent clairement des comportements non constructifs. Une première méthode utilisée depuis plusieurs années par l’enseignant titulaire. Et une nouvelle méthode nommée « Child Coaching » mise en place quelques semaines après le début de l’année scolaire afin de pouvoir mesurer les effets bénéfiques ou non de celle-ci sur les comportements des enfants. La méthode Child Coaching ainsi que les concepts disciplinaires sont présentés dans la partie théorique de ce mémoire. La procédure de mise en place de la nouvelle méthode ainsi que les récoltes de données sont exposées dans la partie méthodologie. Les avis des différents enseignants travaillant dans cette même classe sont récoltés avant et après la mise en place du Child Coaching. Les points de vue des enfants et mes propres constats sont aussi présentés dans la partie analyses de cette étude. Les discussions sont liées aux concepts théoriques de base