1,720,957 research outputs found
Euclidean N=2 supergravity
No full textAbstractEuclidean special geometry has recently been investigated in the context of Euclidean supersymmetric theories with vector multiplets. In the rigid case, the scalar manifold is described by affine special para-Kähler geometry while the target geometries of Euclidean vector multiplets coupled to supergravity are given by projective special para-Kähler manifolds. In this Letter, we derive the Killing spinor equations of Euclidean N=2 supergravity theories coupled to vector multiplets. These equations provide the starting point for finding general supersymmetric instanton solutions
Isometries of half supersymmetric time-like solutions in five dimensions
No full textSpinorial geometry techniques have recently been used to classify all half supersymmetric solutions in gauged five-dimensional supergravity with vector multiplets. In this paper we consider solutions for which at least one of the Killing spinors generates a time-like Killing vector. We obtain coordinate transformations which considerably simplify the solutions, and in a number of cases, we obtain explicitly some additional Killing vectors which were hidden in the original analysis. © 2010 IOP Publishing Ltd.Behrndt K, 1998, PHYS LETT B, V442, P97, DOI 10.1016-S0370-2693(98)01208-8; Cacciatori SL, 2003, J HIGH ENERGY PHYS; Elvang H, 2005, PHYS REV D, V71, DOI 10.1103-PhysRevD.71.024033; Elvang H, 2004, PHYS REV LETT, V93, DOI 10.1103-PhysRevLett.93.211302; Figueroa-O'Farrill J, 2007, CLASSICAL QUANT GRAV, V24, P4429, DOI 10.1088-0264-9381-24-17-010; Gauntlett JP, 2003, CLASSICAL QUANT GRAV, V20, P4587, DOI 10.1088-0264-9381-20-21-005; Gauntlett JP, 2003, PHYS REV D, V68, DOI 10.1103-PhysRevD.68.105009; Gauntlett JP, 2005, PHYS REV D, V71, DOI 10.1103-PhysRevD.71.025013; Gauntlett JP, 2005, PHYS REV D, V71, DOI 10.1103-PhysRevD.71.045002; Gillard J, 2005, CLASSICAL QUANT GRAV, V22, P1033, DOI 10.1088-0264-9381-22-6-009; Gran U, 2007, J HIGH ENERGY PHYS; Gran U, 2005, CLASSICAL QUANT GRAV, V22, P2453, DOI 10.1088-0264-9381-22-12-010; Gran U, 2006, NUCL PHYS B, V753, P118, DOI 10.1016-j.nuclphysb.2006.07.007; Grover J, 2007, CLASSICAL QUANT GRAV, V24, P417, DOI 10.1088-0264-9381-24-2-009; Grover J, 2008, J HIGH ENERGY PHYS; Gutowski JB, 2004, J HIGH ENERGY PHYS; Gutowski JB, 2007, J HIGH ENERGY PHYS; Gutowski JB, 2004, J HIGH ENERGY PHYS; Gutowski JB, 2005, J HIGH ENERGY PHYS; Gutowski JB, 2004, J HIGH ENERGY PHYS; Harvey F., 1990, SPINORS CALIBRATIONS; Klemm D, 2000, PHYS REV D, V62, DOI 10.1103-PhysRevD.62.024003; Klemm D, 2001, J HIGH ENERGY PHYS; Klemm D, 2001, PHYS LETT B, V503, P147, DOI 10.1016-S0370-2693(01)00181-2; Kunduri HK, 2007, J HIGH ENERGY PHYS; Kunduri HK, 2006, J HIGH ENERGY PHYS; Kunduri HK, 2007, J HIGH ENERGY PHYS; Lawson H. B., 1989, SPIN GEOMETRY; TOD KP, 1983, PHYS LETT B, V121, P241, DOI 10.1016-0370-2693(83)90797-9; Wang M.-Y., 1989, ANN GLOB ANAL GEOM, V7, P59, DOI 10.1007-BF0013740212
Non-Supersymmetric Charged Domain Walls
No full textWe present general non-supersymmtric domain wall solutions with non-trivial scalar and gauge fields for gauged five-dimensional N=2 supergravity coupled to abelian vector multiplets
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Para-Complex Geometry and Gravitational Instantons
No full textWe give a complete classification of supersymmetric gravitational instantons in Euclidean N=2 supergravity coupled to vector multiplets. An interesting class of solutions is found which corresponds to the Euclidean analogue of stationary black hole solutions of N=2 supergravity theories
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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