1,720,962 research outputs found
Interpolating Wilson loops and enriched RG flows
Get PDFWe study new BPS circular Wilson loops in ABJ(M) theory, which are
defined in terms of several parameters that continuously interpolate between
previously known BPS loops (both bosonic and fermionic) and BPS
fermionic loops. We compute the expectation value of these operators up to
second order in perturbation theory using a one-dimensional effective field
theory approach. Within dimensional regularization, we find non-trivial
-functions for the parameters, which are marginally relevant
deformations triggering RG flows from a UV fixed point represented by the
BPS bosonic loop to an IR fixed point represented by a BPS fermionic
loop. Generically, along all flows at least one supercharge of the theory is
preserved, so that we refer to them as enriched RG flows. In particular, fixed
points are connected through BPS fermionic operators. This holds at
framing zero, which is a consequence of the regularization scheme employed. We
also establish a g-theorem, relating the expectation values of the Wilson loops
corresponding to the UV and IR fixed points of the flow, and discuss the
one-dimensional defect SCFT living on the Wilson loop contour.Comment: 45 pages, 13 figures. v2: changes in sec 5 and other minor change
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Entropia de emaranhamento em Teorias de calibre
Get PDFDissertação (mestrado)—Universidade de Brasília, Instituto de Física, Programa de Pós-Graduação em Física, 2017.Neste trabalho, começa-se um estudo sistemático de emaranhamento em teorias de gauge. Adota-se a teoria de Yang-Mills no cilindro como modelo principal. Parte-se da Lagrangiana de Yang-Mills e obtém-se que, resolvendo o vínculo da lei de Gauss, a dinâmica do sistema pode ser reduzida àquela de uma partícula livre movendo-se ao longo da variedade do grupo de gauge. Isso significa que o sistema apresenta somente um grau de liberdade físico. Portanto, não é possível que haja emaranhamento. Acopla-se então a teoria de YangMills à uma partícula livre não-relativística. Uma primeira abordagem é feita considerando o caso abeliano. Obtém-se que o sistema apresenta não só emaranhamento, mas também degenerescência e anomalia axial. Com respeito à anomalia, cálculos analíticos são feitos e sua dependência com relação a outros parâmetros, como energia e degenerescência, é analisada. Com relação ao emaranhamento, cálculos numéricos de entropia de emaranhamento são feitos considerando o estado fundamental. Guiado pelo projeto acima delineado, essa dissertação tem também um objetivo pedagógico, no sentido de introduzir os conceitos de teoria de gauge, teoria de vínculo e teoria de grupos de Lie.In this work a systematic study of entanglement in gauge theories is started. The Yang-Mills theory on a cylinder is adopted as the main model. Starting from the Yang-Mills Lagrangian one obtains that, by solving the Gauss law constraint, the dynamics of the system can be reduced to that of a free particle moving along the gauge group manifold. This means that the system has only one physical degree of freedom. Therefore, the system does not present entanglement. The Yang-Mills theory is then coupled to a non-relativistic free particle. A first approach is made considering the abelian case. One obtains that the system presents not only entanglement, but also degeneracy and axial anomaly. With respect to anomaly, analytical calculations are carried out and its dependence on other parameters, such as energy and degeneracy, is analysed. Concerning entanglement, numerical calculations of entanglement entropy are made considering the ground-state. Guided by the project outlined above, this dissertation also has a pedagogical purpose, in the sense that it introduces concepts of gauge theory, constrained systems and Lie group theory.Instituto de Física (IF)Programa de Pós-Graduação em Físic
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