3,669 research outputs found
Effective Theories for 2+1 Dimensional Non-Abelian Topological Spin Liquids
In this work we propose an effective low-energy theory for a large class of
2+1 dimensional non-Abelian topological spin liquids whose edge states are
conformal degrees of freedom with central charges corresponding to the coset
structure . For particular values of
it furnishes the series for unitary minimal and superconformal models.
These gapped phases were recently suggested to be obtained from an array of
one-dimensional coupled quantum wires. In doing so we provide an explicit
relationship between two distinct approaches: quantum wires and Chern-Simons
bulk theory. We firstly make a direct connection between the interacting
quantum wires and the corresponding conformal field theory at the edges, which
turns out to be given in terms of chiral gauged WZW models. Relying on the
bulk-edge correspondence we are able to construct the underlying non-Abelian
Chern-Simons effective field theory.Comment: 41 pages, 5 figures, typos corrected, references added, published
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Interactions between private and public sector wages
We examine the interactions between public and private sector wages per employee in OECD countries. The growth of public sector wages and of public sector employment positively affects
the growth of private sector wages. Moreover, total factor productivity, the unemployment rate and the degree of urbanisation are also important determinants of private sector wage growth. With respect to public sector wage growth, we find that it is influenced by fiscal conditions in addition to private sector wages. We then set up a dynamic labour market equilibrium model with two sectors, search and matching frictions and exogenous growth to understand the transmission
mechanisms of fiscal policy. The model is quantitative consistent with the main estimation findings
Stress, cognitive appraisal, and psychological health: testing instruments for health professionals
The job of health professionals, including nurses, is considered inherently stressful (Lee & Wang, 2002; Rutledge et al., 2009), and thus it is important to improve and develop specific measures that are sensitive to the demands that health professionals face. This study analysed the psychometric properties of three instruments that focus on the professional experiences of nurses in aspects related to occupational stress, cognitive appraisal, and mental health issues. The evaluation protocol included the Stress Questionnaire for Health Professionals (SQHP; Gomes, 2014), the Cognitive Appraisal Scale (CAS; Gomes, Faria, & Gonçalves, 2013), and the General Health Questionnaire-12 (GHQ-12; Goldberg, 1972). Validity and reliability issues were considered with statistical analysis (i.e. confirmatory factor analysis, convergent validity, and composite reliability) that revealed adequate values for all of the instruments, namely, a six-factor structure for the SQHP, a five-factor structure for the CAS, and a two-factor structure for the GHQ-12. In conclusion, this study proposes three consistent instruments that may be useful for analysing nurses’ adaptation to work contexts
Short- and long-run determinants of sovereign debt credit ratings
We study the determinants of sovereign debt ratings from the three main international rating agencies, for the period 1995-2005. Using linear and ordered response models we employ a specification that allows us to distinguish between short and long-run effects, on a country’s rating, of macroeconomic and fiscal variables. The results point to a good performance of the models in explaining a country’s rating, both across agencies and time. Changes in GDP per capita, GDP growth, government debt, and government balance have a short-run impact on a country’s credit rating, while government effectiveness, external debt, foreign reserves and default history are important long-run determinants
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