1,720,973 research outputs found
Screened perturbation theory
No full textKarsch F, Patkos A, Petreczky P. Screened perturbation theory. Presented at the SPIRES Conference C97/05/21
QCD thermodynamics from 3-D adjoint Higgs model
No full textKarsch F, Oevers M, Patkos A, Petreczky P, Szep Z. QCD thermodynamics from 3-D adjoint Higgs model. 1998
EFFECTIVE SCALAR THEORY OF THE ELECTROWEAK PHASE-TRANSITION
No full textKarsch F, Neuhaus T, PATKOS A. EFFECTIVE SCALAR THEORY OF THE ELECTROWEAK PHASE-TRANSITION. In: Nuclear Physics B - Proceedings Supplements. Nucl. Phys. B, Proc. Suppl. Vol 42. ELSEVIER SCIENCE BV; 1995: 581-583.This talk summarizes results obtained from simulating a three dimensional pure Order Parameter (OP) model of the Electroweak Phase Transition (EWPT). Its detailed presentation appears in [1]
The O(g(6)) coefficient in the thermodynamic potential of hot SU(N) gauge theories and MQCD
No full textKarsch F, Lütgemeier M, Patkos A, Rank J. The O(g(6)) coefficient in the thermodynamic potential of hot SU(N) gauge theories and MQCD. PHYSICS LETTERS B. 1997;390(1-4):275-282.The non-perturbative input necessary for the determination of the O(g(6)) part of the weak coupling expansion of the free energy density for SU(2) and SU(3) gauge theories is estimated. Although the perturbative information completing the contribution to this order is missing, we give arguments that the magnetic fluctuations are dominated by screened elementary magnetic gluons
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
The non-perturbative O(g(6)) contribution to the free energy of hot SU(N) gauge theory
No full textLütgemeier M, Karsch F, Patkos A, Rank J. The non-perturbative O(g(6)) contribution to the free energy of hot SU(N) gauge theory. In: Nuclear Physics B - Proceedings Supplements. NUCLEAR PHYSICS B. Vol 53. ELSEVIER SCIENCE BV; 1997: 417-419.The non-perturbative input necessary for the determination of the O(g(6)) part of the weak coupling expansion of the free energy density for SU(2) and SU(3) gauge theories is estimated. Although the perturbative information completing the contribution to this order is missing, we give arguments that the magnetic fluctuations are dominated by screened elementary magnetic gluons
EFFECTIVE SCALAR FIELD-THEORY FOR THE ELECTROWEAK PHASE-TRANSITION
No full textKarsch F, Neuhaus T, PATKOS A. EFFECTIVE SCALAR FIELD-THEORY FOR THE ELECTROWEAK PHASE-TRANSITION. NUCLEAR PHYSICS B. 1995;441(3):629-657.We investigate an effective model for the finite-temperature symmetry-restoration phase transition of the electroweak theory. It is obtained by dimensional reduction of the (3 + 1)-dimensional full theory and by subsequent integration over all static gauge degrees of freedom. The resulting theory corresponds to a 3-dimensional 0(4) ferromagnet containing cubic and quartic terms of the field in its potential function. Possible nonperturbative effects of a magnetic screening mass are parametrically included in the potential, We analyse the theory using mean-field and numerical Monte Carlo (MC) simulation methods. At the value of the physical Higgs mass, m(H) = 37 GeV, considered in the present investigation, we find a discontinuous symmetry-restoring phase transition, We determine the critical temperature, order parameter jump, interface tension and latent heat characteristics of the transition. The Monte Carlo results indicate a somewhat weaker first-order phase transition as compared to the mean-field treatment, demonstrating that non-perturbative fluctuations of the Higgs field are relevant, This effect is especially important for the interface tension. Any observation of hard first-order transition could result only from non-perturbative effects related to the gauge degrees of freedom
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
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