Solutions for Klein-Gordon equation in Randall-Sundrum-Kerr scenario

We study the scalar perturbations of rotating black holes in framework of extra dimensions type Randall-Sundrum(RS).Comment: 2 pages, revtex4, contribution to conference "100 years of Relativity", Sao Paulo, Brazil, Aug. 22-24, 200

Explaining Demand for Higher Education

Recognizing the crucial role of higher education for the development of nations and individuals, many countries have recently established ambitious targets for the percentage of graduates in their population by 2020. In peripheral European Union countries, however, such objectives may be difficult to attain. In fact, both the current stringent fiscal consolidation processes and the overall depressed economic environment may exert negative effects upon domestic demand for higher education. Such uncertain context increases the need for efficient policies and henceforth the value of obtaining reliable information on the variables that are more likely to influence demand. In this study, we employ the partial least squares methodology, which allows modeling with many variables, even with relatively few observations, to identify the most relevant determinants of demand for higher education. We focus in the case of Portugal, a country where applications for higher education are centralized and thus provides a long and reliable set of data on aggregate demand. The results of our empirical analysis suggest that the most relevant determinants of demand are institutional and/or policy dependent and, therefore, may be controlled by decision makers and managed to support national strategic objectives. These results, obtained for Portugal, are also useful particularly for other southern European Union countries, which share some of the Portuguese economic, social, demographic and cultural characteristics

Assessing French Inflation Persistence with Impulse Saturation Break Tests and Automatic General-to-Specific Modelling

This paper has three different motivations. Firstly, we wish to contribute to the debate on whether French inflation has been persistent since the mid-eighties. Empirical evidence in this domain has been mixed. We use the standard method of testing for breaks in the mean of the inflation series to conclude whether possible unit root findings are the result of neglected breaks. Then, we build standard autoregressive representations of inflation, using an automatic general-to-specific approach. We conclude against inflation persistence in the sample period, and the point estimates of persistence we obtain are several percentage points below those achieved with other break tests and model selection methods. Moreover, our final model is congruent. Secondly, we provide the first empirical application of the new impulse saturation break test. The resulting estimates of the break dates are in line with other literature findings and have a sound economic meaning, confirming the good performance the test had revealed in theoretical and simulation studies. Finally, we also illustrate the shortcomings of the Bai-Perron test when applied to a small sample with high serial correlation. Indeed, we show the Bai- Perron break dates’ estimates would not allow us to build a congruent autoregressive representation of inflation.Inflation Persistence, Break Tests, Model Selection, General-to-Specific