17 research outputs found
Random matrix theory and spectral sum rules for the Dirac operator in QCD
We construct a random matrix model that, in the large limit, reduces to
the low energy limit of the QCD partition function put forward by Leutwyler and
Smilga. This equivalence holds for an arbitrary number of flavors and any value
of the QCD vacuum angle. In this model, moments of the inverse squares of the
eigenvalues of the Dirac operator obey sum rules, which we conjecture to be
universal. In other words, the validity of the sum rules depends only on the
symmetries of the theory but not on its details. To illustrate this point we
show that the sum rules hold for an interacting liquid of instantons. The
physical interpretation is that the way the thermodynamic limit of the spectral
density near zero is approached is universal. However, its value, the
chiral condensate, is not.Comment: 18 pages, SUNY-NTG-92/4
Spectrum of the Dirac operator in a QCD instanton liquid: two versus three colors
Approximating the sum over all gauge field configurations in the QCD
partition function by a liquid of instantons, we calculate the spectrum of the
Dirac operator for two and three colors and for 0, 1 and 2 flavors. We find a
remarkable difference in the spectrum near zero virtuality between 2 and 3
colors, which can be explained in terms of chiral random matrix theory. For two
colors the Dirac operator is real, and the appropriate random matrix ensemble
has real matrix elements. For three colors the Dirac operator is complex, and
the spectrum can be described by a random matrix ensemble with complex matrix
elements. These results provide further evidence that the spectrum near zero
virtuality is universal and is completely determined by symmetries.Comment: 12 pages and 2 figures (available on request), SUNY-NTG-94/
Which investors fear expropriation? Evidence from investors' stock picking
Includes bibliographical references. Title from cover. Also available via the InternetAvailable from British Library Document Supply Centre- DSC:3597. 9512(no 3843) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
Transmission of the substituent effects in 2-substituted benzimidazoles studied by1H and13C nuclear magnetic resonance
Some general laws of human emotion: Interrelationships between intensities of desire, expectation, and emotional feeling
I feel like a scrambled egg in my head: an idiographic case study of meaning making and anger using interpretative phenomenological analysis
What does it feel like when one’s meaning making is impoverished and threatens to break down? The aim of this study is to show how meaning making is achieved in the context of one’s life and how this achievement is often a struggle for the individual. The study reports data from semi-structured interviews with a female participant, which was analysed using interpretative phenomenological analysis (IPA). This paper examines how cultural discourses and conventions are experienced and given meaning by the individual. First, the analysis demonstrates how dominant discourses are used to explain anger and aggression. These include hormones, alcohol, and the influence of past relationships on present action. Second, it examines how the participant’s meaning making is often ambiguous and confused, and how she variously accepts and challenges available meanings. Finally, the analysis demonstrates how meaning making can break down and the consequences of this for the individual’s sense of self