64,619 research outputs found
Non standard parametrizations and adjoint invariants of classical groups
We obtain local parametrizations of classical non-compact Lie groups where
adjoint invariants under maximal compact subgroups are manifest. Extension to
non compact subgroups is straightforward. As a by-product parametrizations of
the same type are obtained for compact groups. They are of physical interest in
any theory gauge invariant under the adjoint action, typical examples being the
two dimensional gauged Wess-Zumino-Witten-Novikov models where these
coordinatizations become of extreme usefulness to get the background fields
representing the vacuum expectation values of the massless modes of the
associated (super) string theory.Comment: 11 pages, latex file, La Plata preprint Th-99/01. Minor changes in
the introduction, version to appear in Physics Letters
Differences between sources of government expenditure in education and health, Tanzania
Reliable data on government expenditure in priority sectors, such as health and education, is a key ingredient into the analysis of public policy effectiveness. This brief note has two primary goals: (i) to document the increasing divergence over time between various official Tanzanian data sources on spending in these two sectors, and (ii) to outline possible explanations for this divergence and highlight its consequences for social expenditure analysis
A note on the non-commutative Chern-Simons model on manifolds with boundary
We study field theories defined in regions of the spatial non-commutative
(NC) plane with a boundary present delimiting them, concentrating in particular
on the U(1) NC Chern-Simons theory on the upper half plane. We find that
classical consistency and gauge invariance lead necessary to the introduction
of -space of square integrable functions null together with all their
derivatives at the origin. Furthermore the requirement of closure of
under the *-product leads to the introduction of a novel notion of the
*-product itself in regions where a boundary is present, that in turn yields
the complexification of the gauge group and to consider chiral waves in one
sense or other. The canonical quantization of the theory is sketched
identifying the physical states and the physical operators. These last ones
include ordinary NC Wilson lines starting and ending on the boundary that yield
correlation functions depending on points on the one-dimensional boundary. We
finally extend the definition of the *-product to a strip and comment on
possible relevance of these results to finite Quantum Hall systems.Comment: 15 pages, references added, to appear in International Journal of
Modern Physic
Fearless: Kevin Lugo
This summer, recent graduate Kevin Lugo will bike over 4,000 miles across the country to benefit the Ulman Cancer Fund for Young Adults. His choice to bike for seventy days from Baltimore to Seattle makes him fearless! His goal is to raise $7,476 for the organization, and he reached that goal last night (although more donations are always welcome in support of fighting cancer)! Kevin explains that when he studied abroad in Denmark in the fall of 2011, he “fell in love with sustainable transportation, especially cycling.” Not only does his fearless endeavor raise money to fight cancer, but he is also supporting healthy environmental practices. [excerpt
Multidimensional Poverty Measures from an Information Theory Perspective
This paper proposes to use an information theory approach to the design of multidimensional poverty indices. Traditional monetary approaches to poverty rely on the strong assumption that all relevant attributes of well-being are perfectly substitutable. Based on the idea of the essentiality of some attributes, scholars have recently suggested multidimensional poverty indices where the existence of a trade-off between attributes is relevant only for individuals who are below a poverty threshold in all of them (Bourguignon and Chakravarty 2003, Tsui 2002). The present paper proposes a method which encompasses both approaches and, moreover, it opens the door to an intermediate position which allows, to a certain extent, for substitution of attributes even in the case in which one or more (but not all) dimensions are above the set threshold. An application using individual well-being data from Indonesian households in 2000 is presented in order to compare the results under the different approaches.
Comparing Multidimensional Indices of Inequality: methods and application
The paper provides an examination into the measures of multidimensional inequality proposed in the past few years, their properties and majorization criteria. It offers a generalisation of Bourguignon index proposed so that it includes Tsui measures (1999) while preserving the virtues of Maasoumi’s method (1986) of explicitly acknowledging the role of parameters relevant of multivariate settings. An application to the Argentine data is provided to illustrate the decisions involved in the process of applying these measures and the usefulness of having appropriate criteria for the choice.Inequalities, Multidimensional Distributions, Well-being, Multivariate indices.
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