Consistent massive truncations of IIB supergravity on Sasaki-Einstein manifolds

Recent work on holographic superconductivity and gravitational duals of systems with non-relativistic conformal symmetry have made use of consistent truncations of D=10 and D=11 supergravity retaining some massive modes in the Kaluza-Klein tower. In this paper we focus on reductions of IIB supergravity to five dimensions on a Sasaki-Einstein manifold, and extend these previous truncations to encompass the entire bosonic sector of gauged D=5, N=2 supergravity coupled to massive multiplets up to the second Kaluza-Klein level. We conjecture that a necessary condition for the consistency of massive truncations is to only retain the lowest modes in the massive trajectories of the Kaluza-Klein mode decomposition of the original fields. This is an extension of the well-known result that consistent truncations may be obtained by restricting to the singlet sector of the internal symmetry group.Comment: 27 pages, typos corrected and references adde

Intersecting M-branes and bound states

In this paper, we construct multi-scalar, multi-center $p$-brane solutions in toroidally compactified M-theory. We use these solutions to show that all supersymmetric $p$-branes can be viewed as bound states of certain basic building blocks, namely $p$-branes that preserve $1/2$ of the supersymmetry. We also explore the M-theory interpretation of $p$-branes in lower dimensions. We show that all the supersymmetric $p$-branes can be viewed as intersections of M-branes or boosted M-branes in $D=11$.Comment: Latex, 14 pages, no figures. References adde

Electronic simulation of a barometric pressure sensor for the meteorological monitor assembly

An analysis of the electronic simulation of barometric pressure used to self-test the counter electronics of the digital barometer is presented. The barometer is part of the Meteorological Monitor Assembly that supports navigation in deep space communication. The theory of operation of the digital barometer, the design details, and the verification procedure used with the barometric pressure simulator are presented

Designing Carolina: The construction of an early American social and geographical landscape, 1670-1719

This study explores the promotion, population and settlement of the Carolina lowcountry and evaluates the colony\u27s pioneer years, the period before an English-dominated plantation society achieved supremacy. Many designers participated in the construction of proprietary South Carolina\u27s social and geographical landscapes. The explorers and propagandists who first characterized the colony for European audiences developed the region in the minds of potential emigrants. their recruitment campaigns determined in part the people who colonized the province. The Lords Proprietors and their agents, who devised an elaborate settlement program set forth in the Fundamental Constitutions and other land policies, influenced how Carolina evolved physically and socially. The planters and surveyors who lived and worked within this system reshaped it to serve their own ends, thus altering the complexion of the colonial lowcountry landscape. Finally, the European and Indian cartographers who drew maps of the southeastern region created and interpreted the imagined and actual geography of Carolina.;Despite the small number of private papers surviving from the proprietary period, extant records reveal a considerable amount about white Carolinians\u27 approaches to and occupation of lowcountry lands. The sources examined in this study include exploratory narratives and promotional literature, correspondence and journals of colonial officials, land warrants and grants, surveyors\u27 guidebooks and plats, and historical maps of southeastern North America. Indeed, the public records dating from 1670 to 1710 are particularly suited to a geographic interpretation of South Carolina.;In one sense, the story of South Carolina\u27s first settlement and initial development suffers from the tendency of scholars to read history backwards from the fully-evolved plantation societies of the later eighteenth and nineteenth centuries and to apply predominately economic interpretations to the colony\u27s earliest years. This dissertation takes another approach and concentrates on the creation of the colony both in perception and practice. as the first comprehensive analysis of the conceptualization, peopling, and construction of social and geographical landscapes in South Carolina, it integrates the history of a single southern colony within the broader contexts of early American and Atlantic world histories

The Identification and Classification of Flow Disruptions in the Operating Room during Laparoscopic Cholecystectomy and Open Hernia Repair Procedures

The operating room is one of the most complex work environments in healthcare; it is estimated that at least 7% of adverse events due to medical error occur in the operating room. Flow disruptions are events that cause a break in the primary surgical task, or the loss of any team member\u27s situational awareness. An empirical link between flow disruptions and surgical errors in the OR has been established; therefore, identifying and classifying the specific flow disruptions present during different types of procedures should facilitate the development of evidence-based interventions. The goal of this study was to identify and classify flow disruptions during laparoscopic cholecystectomy (camera-assisted gallbladder removal) and open inguinal and umbilical hernia repair procedures. Results of this study revealed seven categories of disruption that emerged inductively from the data collected. These were: communication, coordination, external/extraneous source, training/supervisory, equipment/supplies, patient factors, and environment. Though the average duration and disruption rate were similar for both types of procedure, the type of disruptions present during each were unique. One example of this includes the higher incidence of equipment related flow disruptions during laparoscopic cholesystechtomies, which is the more equipment intensive procedure of the two observed

Resolution of Cosmological Singularities

We show that a class of 3+1 dimensional Friedmann-Robertson-Walker cosmologies can be embedded within a variety of solutions of string theory. In some realizations the apparent singularities associated with the big bang or big crunch are resolved at non-singular horizons of higher-dimensional quasi-black hole solutions (with compactified real time); in others plausibly they are resolved at D-brane bound states having no conventional space-time interpretation.Comment: 11 pages, latex. Two references added, one typo correcte

Timelike Hopf Duality and Type IIA^* String Solutions

The usual T-duality that relates the type IIA and IIB theories compactified on circles of inversely-related radii does not operate if the dimensional reduction is performed on the time direction rather than a spatial one. This observation led to the recent proposal that there might exist two further ten-dimensional theories, namely type IIA^* and type IIB^*, related to type IIB and type IIA respectively by a timelike dimensional reduction. In this paper we explore such dimensional reductions in cases where time is the coordinate of a non-trivial U(1) fibre bundle. We focus in particular on situations where there is an odd-dimensional anti-de Sitter spacetime AdS_{2n+1}, which can be described as a U(1) bundle over \widetilde{CP}^n, a non-compact version of CP^n corresponding to the coset manifold SU(n,1)/U(n). In particular, we study the AdS_5\times S^5 and AdS_7\times S^4 solutions of type IIB supergravity and eleven-dimensional supergravity. Applying a timelike Hopf T-duality transformation to the former provides a new solution of the type IIA^* theory, of the form \widetilde{CP}^2\times S^1\times S^5. We show how the Hopf-reduced solutions provide further examples of ``supersymmetry without supersymmetry.'' We also present a detailed discussion of the geometrical structure of the Hopf-fibred metric on AdS_{2n+1}, and its relation to the horospherical metric that arises in the AdS/CFT correspondence.Comment: Latex, 26 page

Four-qubit entanglement from string theory

We invoke the black hole/qubit correspondence to derive the classification of four-qubit entanglement. The U-duality orbits resulting from timelike reduction of string theory from D=4 to D=3 yield 31 entanglement families, which reduce to nine up to permutation of the four qubits.Comment: 4 pages, 1 figure, 2 tables, revtex; minor corrections, references adde