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Haldane's Fractional Statistics and the Lowest Landau Level on a Torus
No full textThe Lowest Landau Level on a torus is studied. The dimension of the many-body Hilbert space is obtained and is found to be different from the formula given by Haldane. Our result can be tested in numerical investigations of the low-energy spectrum of fractional quantum Hall states on a torus. PACS:73.20.Dx, 05.30.-d, 03.65.Fd, 71.45.-d, 74.65+n. DFUPG 103-95, IPNO/TH 95, Nordita 95/43 June, 1995 Identical particles with statistics interpolating between Bose and Fermi can exist in two dimensions [1]. Particles which obey fractional statistics (neither bosonic nor fermionic) are called anyons. Here the definition of statistics is the traditional one based on the monodromy properties of manybody wavefunctions. Anyon physics has been applied to the theory of the fractional quantum Hall effect (FQHE) (for the theory of the FQHE, see Ref. [2]; for a review, see Ref. [3]). It is known that quasiparticles in the FQHE are anyons [4, 5]. The condensation of these quasiparticles in Laughlin state..
The Chiral Dirac Determinant According to the Overlap Formalism
No full textThe chiral Dirac determinant is calculated using the overlap formalism of Narayanan and Neuberger. We compare the real and imaginary parts of the determinant with the continuum result for perturbative gauge field backgrounds and show that they are identical. Thus we find that the overlap formalism passes a crucial test. Nordita 95/80 November, 1995 Lattice regularization of field theories is the only known non-perturbative regularization available to us. Chiral gauge theories have eluded a non-perturbative regularization for reasons summarized by the Nielsen-Ninomiya [1, 2] theorem which states that there exists no discretization of the chiral Dirac operator which simultaneously preserves a number of desirable physical properties. This is an unfortunate state of affairs since, at least at low-energies, the Weinberg-Salam model describes the physics of the world we live in, and this model involves chiral couplings of fermions to gauge fields. Recently attempts have been made to evade th..
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
Some Comments on
No full textthis paper and offered many constructive suggestions. I would also like to thank J. de Boer for an illuminating correspondence
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
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