A reciprocal Wald theorem for varying gravitational function

We study when a cosmological constant is a natural issue if it is mimicked by the potential of a massive Hyperextended Scalar Tensor theory with a perfect fluid for Bianchi type I and V models. We then deduce a reciprocal Wald theorem giving the conditions such that the potential tends to a non vanishing constant when the gravitational function varies. We also get the conditions allowing the potentiel to vanish or diverge.Comment: 13 page

The Digital Difference of Online Social Networking in the Carribean

Users of online social networking sites have made significant advances in the development of global virtual communities. With their origins in listservs, egroups, blogs, chat rooms and instant messaging, social networking sites provide opportunities for users with required skills, to construct public or semi-public profiles, to interact with ???friends??? and colleagues across the globe and to collaboratively create social capital. The presentation will focus on the impact of social networking on the Caribbean. It will examine participation of Caribbean people, including candidates in recent general elections held in 2007 and 2008, in popular social networking sites, such as Facebook, MySpace and YouTube. The assessment will cover factors influencing membership and participation, conditions under which content is created and information shared, as well as issues of privacy and protection. In recognition of the successes of these sites in facilitating interaction among large geographically dispersed groups of users, sharing content, collaborating with peers, and linking communities, the presentation will also examine and assess the role of information literacy the activities of library social networking sites, and their contribution to the development of interactive information resources in the social sciences.International Federation of Library AssociationsUniversity of Toronto, LibraryUniversity of Toronto, Faculty of InformationUniversity of Illinois, LibraryTitle VI National Resource Center Grant (P015A060066)unpublishednot peer reviewe

The birth of spacetime atoms as the passage of time

The view that the passage of time is physical finds expression in the classical sequential growth models of Rideout and Sorkin in which a discrete spacetime grows by the partially ordered accretion of new spacetime atoms.Comment: Article based on an invited talk at the conference "Do we need a physics of passage?" Cape Town, South Africa, 10-14 Dec 2012. Submitted for publication in Annals of the New York Academy of Sciences (2014

Isotropisation of Bianchi class A models with a minimally coupled scalar field and a perfect fluid

We look for the necessary conditions allowing the Universe isotropisation in presence of a minimally coupled and massive scalar field with a perfect fluid. We conclude that it arises only when the Universe is scalar field dominated, leading to flat spacelike sections and accelerated expansion, and examine the case of a SUGRA theory.Comment: 15 pages, 1 figur

The Foundation Performance Dashboard: Vital Statistics for Social Impact

Boards and foundation leadership rarely have a clear, consistent, and comprehensive picture of their foundation's performance. Interestingly, this situation persists despite the fact that nearly 60% of foundation CEOs would like to have more board involvement in reviewing the foundation's philanthropic mission and effectiveness. Our experience suggests that this conundrum results from a fundamental uncertainty: Foundations are unsure how to bridge the chasm between the readily available and concise metrics for investment performance and the much more complex, expensive, and subjective data from internal operations and program evaluations