1,720,958 research outputs found
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
Higgs vacuum metastability in gravity
Get PDFExperimental data suggest that the Higgs potential has a lower ground state
at high field values. Consequently, decaying from the electroweak to the true
vacuum nucleates bubbles that expand rapidly and can have dire consequences for
our Universe. This overview of our last study [1] regarding the cosmological
implications of vacuum metastability during Starobinsky inflation was presented
at the HEP2023 conference. Following the framework established in [2], we
showcased our state-of-the-art lower bounds on the non-minimal coupling ,
which resulted from a dedicated treatment of the effective Higgs potential in
gravity. The effects of this consideration involved the generation of
destabilising terms in the potential and the sensitive dependence of bubble
nucleation on the last moments of inflation. In this regime, spacetime deviates
increasingly from de Sitter and thus the validity of our approach reaches its
limit, but at earlier times, we recover our result hinting against eternal
inflation.Comment: 10 pages, 3 figures, based on the parallel talk at HEP2023: 40th
Conference on Recent Developments in High Energy Physics and Cosmology (5-7
April 2023) hosted by the University of Ioannin
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
Constraining the Higgs curvature coupling from vacuum decay during inflation
Get PDFAccording to the current experimental data, the Higgs vacuum appears to be metastable due to the development of a second, lower ground state in its potential. Consequently, this leads to a non-zero rate of vacuum decay through nucleation of bubbles of true vacuum with catastrophic consequences for our false vacuum Universe. Since such an event would render our Universe incompatible with measurements, there cannot have been any such bubble nucleation events anywhere in our whole past lightcone. Thus, we are motivated to study possible stabilising mechanisms in the early universe, focusing on the period of cosmological inflation. We consider a minimal scenario of the Standard Model of particle physics together with single-field, high-scale inflation, while accounting for the time-dependence of the Hubble rate, both in the geometry of our past light-cone and in the Higgs effective potential. The latter is approximated with three- loop renormalization group improvement supplemented with one-loop curvature corrections in de Sitter. We study three one-parameter inflationary models in field theory, quadratic, quartic, and Starobinsky-like power law inflation, and the modified gravity scenario , that leads to the observationally favoured model of Starobinsky inflation. We show that the survival of the vacuum state through inflation places lower bounds on the non-minimal Higgs curvature coupling ξ, the last unknown parameter of the Standard Model. The bounds are significantly stronger in Starobinsky inflation than in field theory models with no Higgs-inflaton coupling, , but are independent of the duration of inflation. However, they are sensitive to the details of the dynamics at the end of inflation, and therefore they can be improved with a more detailed study of that period.Open Acces
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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