Riemannian manifolds with structure group PSU(3)

We study 8-dimensional Riemannian manifolds that admit a PSU(3)-structure. We classify these structures by their intrinsic torsion and characterize the corresponding classes via differential equations. Moreover, we consider a connection defined by a 3- and a 4-form that preserves the underlying structure. Finally, we discuss the geometry of these manifolds relatively to the holonomy algebra of this connection.Comment: 24 page

Remarks on "Resolving isospectral `drums' by counting nodal domains"

In [3] the authors studied the 4-parameter family of isospectral flat 4-tori T^\pm(a,b,c,d) discovered by Conway and Sloane. With a particular method of counting nodal domains they were able to distinguish these tori (numerically) by computing the corresponding nodal sequences relative to a few explicit tuples (a,b,c,d). In this note we confirm the expectation expressed in [3] by proving analytically that their nodal count distinguishes any 4-tuple of distinct positive real numbers.Comment: 5 page

Adapted connections on metric contact manifolds

In this paper, we describe the space of adapted connections on a metric contact manifold through the space of their torsion tensors. The torsion tensor is an element of the space of TM-valued two-forms, which splits into various subspaces. We study the parts of the torsion tensor according to this splitting to completely describe the space of adapted connections. We use this description to obtain characterizations of the generalized Tanaka-Webster connection and to describe the Dirac operators of adapted connections.Comment: 25 pages; some remarks added, minor correction

Democracy, intermediation, and voting in Spain : Some new findings from in-depth and longitudinal data (vol. 2)

The findings reported in this monograph (in two parts, published as WP 351 and WP 352) are based upon a broad-based, multi-method analysis of Spanish politics and society, including five national surveys conducted over nearly three decades, and many in-depth qualitative interviews with a "panel" of respondents who had been interviewed six years earlier. With these rich data resources, we are able to address a number of important hypotheses. We find that lifelong patterns of active engagement with democratic politics are primarily the product of childhood and youngadult political socialization (including formal education and informal socialization within the family) in both the Franco regime and the new democratic political system. In contrast, support for democracy in Spain was acquired primarily through adult political learning, with prominent political elites and their respective parties playing the key roles. Using both cross-sectional survey data and qualitative interview data, we explore the various and complex ways that individuals receive information about politics through relevant political intermediaries. These same data resources enable us to explore between 1979 and 2004 both the processes through which voters acquire potentially stabilizing long-term attitudinal links to partisan politics (especially party identification and left-right loyalties), as well as those forces (especially socio-economic and cultural change, and strategic decisions made by political elites) that can lead to substantial transformations of parties and party systems. For technical reasons, this monograph appears in two parts. The first part (WP 351) deals with the origins of support for democracy, disaffection and political engagement, and political intermediation. The second part (WP 352) focuses on voting, partisanship and ideology, and on the factors explaining the vot

Democracy, intermediation, and voting in Spain: some new findings from in-depth and logitudinal data (vol. 1)

The findings reported in this monograph (in two parts, published as WP 351 and WP 352) are based upon a broad-based, multi-method analysis of Spanish politics and society, including five national surveys conducted over nearly three decades, and many in-depth qualitative interviews with a "panel" of respondents who had been interviewed six years earlier. With these rich data resources, we are able to address a number of important hypotheses. We find that lifelong patterns of active engagement with democratic politics are primarily the product of childhood and youngadult political socialization (including formal education and informal socialization within the family) in both the Franco regime and the new democratic political system. In contrast, support for democracy in Spain was acquired primarily through adult political learning, with prominent political elites and their respective parties playing the key roles. Using both cross-sectional survey data and qualitative interview data, we explore the various and complex ways that individuals receive information about politics through relevant political intermediaries. These same data resources enable us to explore between 1979 and 2004 both the processes through which voters acquire potentially stabilizing long-term attitudinal links to partisan politics (especially party identification and left-right loyalties), as well as those forces (especially socio-economic and cultural change, and strategic decisions made by political elites) that can lead to substantial transformations of parties and party systems. For technical reasons, this monograph appears in two parts. The first part (WP 351) deals with the origins of support for democracy, disaffection and political engagement, and political intermediation. The second part (WP 352) focuses on voting, partisanship and ideology, and on the factors explaining the vote

Concepts historiques du capitalisme industriel avancé : « capitalisme organisé » et « corporatisme »

I. Les économistes comme les spécialistes de sciences sociales semblent largement s’accorder sur le fait que le capitalisme industriel est entré à un moment donné dans une phase avancée de son développement, tout particulièrement dans ses variantes que l’on observe en Europe de l’Ouest, en Amérique du Nord et au Japon. Que le capitalisme se situe encore à cette étape, ou qu’il l’ait entre-temps déjà dépassée et laissée à nouveau derrière lui, il se différencie à tout le moins de la phase ant..