Leibniz and the Problem of Temporary Truths

Not unlike many contemporary philosophers, Leibniz admitted the existence of temporary truths, true propositions that have not always been or will not always be true. In contrast with contemporary philosophers, though, Leibniz conceived of truth in terms of analytic containment: on his view, the truth of a predicative sentence consists in the analytic containment of the concept expressed by the predicate in the concept expressed by the subject. Given that analytic relations among concepts are eternal and unchanging, the problem arises of explaining how Leibniz reconciled one commitment with the other: how can truth be temporary, if concept-containment is not? This paper presents a new approach to this problem, based on the idea that a concept can be consistent at one time and inconsistent at another. It is argued that, given a proper understanding of what it is for a concept to be consistent, this idea is not as problematic as it may seem at first, and is in fact implied by Leibniz’s general views about propositions, in conjunction with the thesis that some propositions are only temporarily true

Tri-bimaximal and bimaximal neutrino mixing from discrete symmetries

The neutrino oscillation data are well explained by the tri-bimaximal pattern. Recently it has been shown that also the bimaximal pattern could be a very good starting point in order to describe the lepton mixing. In this paper I review both the flavour structures and then I present an explicit example.Comment: 4 pages; Talk given at IFAE 2009: Incontri di Fisica delle Alte Energie, Bari, Italy, 15-17 April 200

Theoretical Models for Neutrino Masses

The recent measurements of the neutrino reactor angle require a re-examination of flavour models based on discrete groups. Indeed, when these models deal with the Tri-Bimaximal, the Bimaximal and the Golden Ratio mixing patterns, some tensions arise in order to accommodate the reactor angle. In particular, strong constraints come from lepton flavour violating processes, like mu -> e gamma. We present the analysis and the main results.Comment: 8 pages, 3 figures. Contribution at "Les Rencontres de Physique de la Vall\'ee d'Aoste". To be published as an issue of Nuovo Cimento

The Transparency of Politics and the Quality of Politicians

Politics has always attracted the attention of the media, citizens organizations, and the general public. Recent years have also witnessed a global process of “spectacularization” of politics, which, among other things, has resulted in a dramatic increase in the amount of information available about many facets of political life. Politicians, for example, are public figures, and much of what they do is now the object of close public scrutiny. Nevertheless, the extent to which various aspects of what goes on within the political sector are observable from the outside, which we refer to as the transparency of politics, still varies a great deal across countries. For example, while in some countries all individual votes in the legislature are part of the public record (e.g., the United States and Sweden), this is not the case in others (e.g., Italy and Spain). Also, while many democracies have adopted disclosure laws that require political parties and politicians to report all the contributions they receive (e.g., Canada and the United Kingdom), such laws are not in place in several other countries (e.g., Austria and Finland). It is therefore interesting to ask whether the transparency of politics may be systematically related to political outcomes, and whether more transparency would lead to better outcomes. In particular, in this article, we analyze the relationship between the transparency of politics and the quality of politicians, and focus on the recruitment of politicians by political parties. Parties represent a fundamental institution of representative democracy, and are the political-sector analogues of firms in the market sector. By and large, politicians are affiliated with a party, and typically start their political careers by working for party organizations (see, e.g., Heinrich Best and Maurizio Cotta 2000). Hence, the recruiting decisions of parties determine the quality of the pool of politicians

Dark matter within the minimal flavour violation ansatz

Minimal Flavour Violation hypothesis can provide an attractive framework for Dark Matter (DM). We consider scalar DM candidates carrying flavour quantum numbers and whose representation under the flavour group guarantees DM stability. They interact with the Standard Model fields through Higgs portal at renormalisable level and also to quarks through dimension-6 operators. We provide a systematic analysis of the viable parameter space for the DM fields, which are triplet of the flavour group, considering several DM-quark interactions. In this framework, we analyse in which cases the viable parameter space differs from Higgs portal models thanks to the underlying flavour structure. In contrast to minimal Higgs portal scenarios, we find that light DM in the GeV mass range as well as heavier candidates above Higgs resonance could be allowed by colliders, direct and indirect DM detection searches as well as flavour constraints. The large mass regime above the top mass could even be beyond the reach of future experiments such as Xenon 1T.Comment: 11 pages, 2 figures; v2: references added, version published on Phys.Lett.