l-Adic Étale Cohomology of PEL Type Shimura Varieties with Non-Trivial Coefficients

Given a Shimura datum (G, h) of PEL type, let p be an odd prime at which G is unramified. In [13], we established a formula computing the l-adic cohomology of the associated Shimura varieties (regarded as a representation of the acidic points of G and of the local Weil group at p) in terms of that of their local models at p (the associated Rapoport-Zink spaces) and of the corresponding Igusa varieties. In this paper we extend those results (which are for cohomology with constant l-adic coefficients) to the general case of coefficients in a lisse étale sheaf attached to a finite dimensional l-adic representation of the group G

The evolution of ideology, fairness and redistribution

Ideas about what is "fair" above and beyond the individuals' position in the income ladder determine preferences for redistribution. We study the dynamic evolution of different economies in which redistributive policies, perception of fairness, inequality and growth are jointly determined. We show how including fairness explains various observed relationship between inequality, redistribution and growth. We also show how different beliefs about fairness can keep two otherwise identical countries in different development paths for a very long time.Inequality, Fairness, Redistribution, Ideology.

Public Spending and Volunteering: "The Big Society", Crowding Out, and Volunteering Capital.

The current British Government's "Big Society" plan is based on the idea that granting more freedom to local communities and volunteers will compensate for a withdrawal of public agencies and spending. This idea is grounded on a widely held belief about the relationship between government and volunteering: a high degree of government intervention will cause a crowding out of voluntary activity. Up to now, however, the crowding out hypothesis has hardly been supported by any empirical evidence or solid theoretical foundations. We develop a simple theoretical model to predict how fiscal policy affects the individual decision to volunteer or not. The predictions of the model are tested through the econometric analysis of two survey data sets, and interpretative analysis of narratives of local volunteers and public officials. Contrary to conventional wisdom, our results suggest that volunteering, by the individuals in the actively working population, declines when government intervention is decreased.Volunteering, Labor Supply, Public Goods, Altruism.

Exploring the effects of phrase-final lengthening in Italian Sign Language (LIS) noun phrases

Phrase-final lengthening is a quite common prosodic phenomenon, previously accounted for in several spoken and signed languages. This study aims at investigating the prosodic cues produced in correspondence with the final boundary of noun phrases in Italian Sign Language (LIS), analyzing corpus data from both quantitative and qualitative perspectives. The quantitative analysis confirms that noun phrases in LIS are affected by phrase-final lengthening (i.e. in noun phrases including one nominal modifier, on average, postnominal modifiers are longer than prenominal ones) and reveals that the various modifier classes show different degrees of sensitivity to this phenomenon. Building on these results, the qualitative analysis explores in detail those modifier classes that show lengthening effects in the corpus: the main consequences in the phonological makeup of signs are insertion of movement repetition, prolonged path movement, final hold accompanied by head nod, and weak prop. The study also offers possible explanations for the fact that quantifiers, ordinals, and determinerlike pointing signs are less sensitive to lengthening effects in the phrase-final boundary, suggesting that particular morphosyntactic factors may come into play.---Original in English.Phrase-final lengthening is a quite common prosodic phenomenon, previously accounted for in several spoken and signed languages. This study aims at investigating the prosodic cues produced in correspondence with the final boundary of noun phrases in Italian Sign Language (LIS), analyzing corpus data from both quantitative and qualitative perspectives. The quantitative analysis confirms that noun phrases in LIS are affected by phrase-final lengthening (i.e. in noun phrases including one nominal modifier, on average, postnominal modifiers are longer than prenominal ones) and reveals that the various modifier classes show different degrees of sensitivity to this phenomenon. Building on these results, the qualitative analysis explores in detail those modifier classes that show lengthening effects in the corpus: the main consequences in the phonological makeup of signs are insertion of movement repetition, prolonged path movement, final hold accompanied by head nod, and weak prop. The study also offers possible explanations for the fact that quantifiers, ordinals, and determinerlike pointing signs are less sensitive to lengthening effects in the phrase-final boundary, suggesting that particular morphosyntactic factors may come into play.-----------------------------------------------------------------------------EXPLORANDO OS EFEITOS DO ALONGAMENTO EM FINAL EM SINTAGMAS NOMINAIS DA LÍNGUA DE SINAIS ITALIANA (LIS)O alongamento final é um fenômeno prosódico comum, que já foi observado em diversas línguas orais e de sinais. Este estudo tem por objetivo investigar as pistas prosódicas produzidas em correspondência com os limites do sintagma nominal na língua de sinais italiana (LIS), analisando dados quantitativos e qualitativos oriundos de corpus. A análise quantitativa confirma que os sintagmas nominais em LIS são afetados pelo alongamento final (ex: em sintagmas nominais que incluem um modificador nominal, em média, modificadores pós-nominais são mais longos em comparação com os pré-nominais) e revela que as várias classes de modificadores exibem diferentes graus de sensitividade a este fenômeno. A partir dos resultados, a análise qualitativa explora em detalhes as classes de modificadores que demonstram os efeitos do alongamento no corpus: as principais consequências para a constituição fonológica dos sinais são a adição de uma repetição do movimento, um prolongamento da trajetória do movimento, suspensão final acompanhada por um aceno de cabeça e a sustentação fraca do sinal. O estudo traz também possíveis explicações para o fato de que os sinais quantificadores, ordinais e as apontações com função de determinante são menos sensíveis aos efeitos de alongamento nos limites fronteiriços entre os sintagmas, sugerindo que alguns fatores específicos de ordem morfossintática possam estar também em jogo.---Original em inglês

On the cohomology of certain PEL-type Shimura varieties

In this article we study the local geometry at a prime p of PEL-type Shimura varieties for which there is a hyperspecial level subgroup. We consider the Newton polygon stratification of the special fiber at p of Shimura varieties and show that each Newton polygon stratum can be described in terms of the products of the reduced fibers of the corresponding PEL-type Rapoport-Zink spaces with certain smooth varieties (which we call Igusa varieties) and of the action on them of a p-adic group that depends on the stratum. We then extend our construction to characteristic zero and, in the case of bad reduction at p, use it to compare the vanishing cycle sheaves of the Shimura varieties to those of the Rapoport-Zink spaces. As a result of this analysis, in the case of proper Shimura varieties we obtain a description of the l-adic cohomology of the Shimura varieties in terms of the l-adic cohomology with compact supports of the Igusa varieties and of the Rapoport-Zink spaces for any prime l≠p

Ideology and the State: an Analysis of the Connection between Fairness, Altruism, and Redistribution

The aim of this thesis is to overcome the simplistic idea of homo economicus, by exploring the voting behaviour of heterogeneous agents whose actions are also influenced by their view of social justice and altruism. The thesis consists of four essays which explore the role of non-economic variables in defining individuals preferences. The first essay develops the path-breaking approach initiated by Alesina and Angeletos (2005). It takes in consideration citizens' demand for fairness, and analyses their political choices in a multidimensional scenario. We show how including fairness explains various observed correlations between inequality, redistribution and growth. The second essay analyses the connection between ideology and public schooling. It presents a model in which individuals care about their personal wealth, as well as about the public expenditure, which is allocated by the government between education and the public good. The third essay deepens the analysis of the connection between the ideas of fairness and redistribution and how these evolve over time, and considers a society in which two instruments are available: an income tax and a wealth tax. To avoid double taxation of income, a tax differential is computed, which means that the income tax is subtracted from the wealth tax. The fourth essay analyses the current British Government's "Big Society" plan, which is based on the idea that granting more freedom to local communities and volunteers will compensate for a withdrawal of public agencies and spending. The main conclusion that can be drawn from this thesis is that ideology and altruism deeply influence individuals' preferences and behaviour and can affect political elections and economic fundamentals