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Abstract Dark energy represents one of the greatest mysteries of current science: is it a cosmological constant, an exotic fluid or the manifestation of a modification of the laws of gravity on a large scale ? To answer this crucial question, we need both …

Abstract A cosmological constant is still possible, according to current observations  : microwave cosmological background, galaxy surveys, etc. But the fine-tuning problem is too restrictive, and doesn't allow us to make the link with the inflaton, a …

Abstract According to the classical view, the content of a concept is its associated definition. To master or possess a concept is to have at least tacit knowledge of the definition in question. So, of course, the content of a concept determines its …

Résumé Si les hommes sont plus souvent confrontés à la survenue d’un infarctus du myocarde que les femmes, elles sont en revanche plus à risque de décéder des suites de cette pathologie que leurs homologues masculins. Une analyse sociologique basée sur …

Abstract How can we explain the fact that, even when the severity and management of a stroke are equivalent, members of the working classes recover less well than those from the middle and upper classes, and women less than men  ? That social properties …