1,720,990 research outputs found
LOCALIZATION OF QUANTUM FIELDS ON BRANES
No full textA mechanism for localization of quantum fields on a s-brane, representing the boundary of a (s + 2)-dimensional bulk space, is investigated. Minkowski and AdS bulk spaces are analyzed. Besides the background geometry, the relevant parameters controlling the theory are the mass M and a real parameter eta, specifying the boundary condition on the brane. The importance of exploring the whole range of allowed values for these parameters is emphasized. Stability in Minkowski space requires eta greater than or equal to -M, whereas in the AdS background all real eta are permitted. Both in the flat and in AdS case, the induced field on the brane is a non-canonical generalized free field. For a suitable choice of boundary condition, corresponding to the presence of a boundary state, the induced field on the brane mimics standard (s + 1)-dimensional physics. In a certain range of eta, the spectral function in the the AdS case is dominated by a massive excitation, which imitates the presence of massive particle on the brane. We show that the quantum field induced on the brane is stabl
Interplay Between Chiral Anomalies and Supersymmetry
No full textWe discuss the structure of the chiral anomaly in supersymmetric gauge theories in both the manifestly SUSY covariant approach and the Wess-Zumino gauge. In four dimensions we derive the SUSY anomaly in the W-Z gauge from the SUSY invariant expression of the chiral anomaly. We give a prescription for the computation of the SUSY anomaly in higher dimensions and present the resulting expression in six dimensions
Link invariants from Chern-Simons theory
No full textSome general features of the quantization of the Chern-Simons theory are described. We focus on the computation of the expectation values of Wilson line operators and on the braid group representation realized on the physical state space of the model
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
Chern-Simons field theory and link invariants
No full textThe quantization of the non-abelian Chern-Simons theory in three dimensions is performed in the framework of the BRS formalism. The perturbative analysis at two loops confirms that the model is finite. The vacuum expectation values of the Wilson line operators and the link invariant polynomials is discussed. We derive an explicit analytic expression for the second coefficient of the Alexander-Conway polynomial, which is related to the Arf and Casson invariants
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