1,720,974 research outputs found
Open Descendants in Conformal Field Theory (TOPCITE con 64 citazioni su INSPIRE HEP)
No full textOpen descendants extend Conformal Field Theory to unoriented surfaces with boundaries. The construction
rests on two types of generalizations of the fusion algebra. The first is needed even in the relatively simple case of
diagonal models. It leads to a new tensor that satisfies the fusion algebra, but whose entries are signed integers.
The second is needed when dealing with non-diagonal models, where Cardy’s ansatz does not apply. It leads to a
new tensor with positive integer entries, that satisfies a set of polynomial equations and encodes the classification of the allowed boundary operators
Completeness Conditions for Boundary Operators in 2D Conformal Field Theory (TOPCITE: 204 citazioni su INSPIRE HEP)
No full textIn non-diagonal conformal models, the boundary fields are not directly related to the bulk spectrum. We illustrate some
of their features by completing previous work of Lewellen on sewing constraints for conformal theories in the presence
of boundaries. As a result, we include additional open sectors in the descendants of D&d SU(2) WZW models. A new
phenomenon emerges, the appearance of multiplicities and fixed-point ambiguities in the boundary algebra not inherited
from the closed sector. We conclude by deriving a set of polynomial equations, similar to those satisfied by the fusion-rule
coefficients N$, for a new tensor Aib that determines the open spectrum
Planar Duality in SU(2) WZW Models (TOPCITE: 149 citazioni su INSPIRE HEP)
No full textWe show how to generalize the SCJ( 2) WZW models to allow for open and unoriented sectors. The construction exhibits
some novel patterns of Chan-Paton charge assignments and projected spectra that reflect the underlying current algebra
The Open Descendants of Non-Diagonal SU(2) WZW Models (TOPCITE: 144 citazioni su INSPIRE HEP)
No full textComments on Gepner Models and Type-I Vacua in String Theory (TOPCITE: 125 citazioni su INSPIRE HEP)
No full textChiral Asymmetry in Four-Dimensional Open String Vacua (TOPCITE: 229 citazioni su SPIRES HEP)
No full text
Open strings on the Neveu-Schwarz 5-brane
No full textWe analyze the propagation of open and unoriented strings on the Neveu-Schwarz 5-brane (N5-brane) along the lines of a similar analysis for the SU(2) WZNW models. We discuss the two classes of open descendants of the diagonal models and a series of Z(2) projected models which exist only for even values of the level k and correspond to branes at D-type orbifold singularities. The resulting configurations of branes and planes are T-dual to those relevant to the study of dualities in super Yang-Mills theories, The association of Chan-Paton factors to D-brane multiplicities is possible in the semi-classical limit k --> infinity, but due to strong curvature effects is unclear for finite k, We show that the introduction of a magnetic field implies a twist of the SU(2) current algebra in the open-string sector leading to space-time supersymmetry breaking. (C) 1998 Elsevier Science B.V
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
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