La disparition du temps en gravitation quantique

Le but de ce travail est d’examiner l’incidence philosophique de la gravitation quantique sur le concept de temps. Je cherche à montrer qu’elle conduit à une disparition du temps comme dimension et ouvre la voie à une compréhension du temps comme variation et même à l’idée de variation pure. En l’absence de temps mécanique, il est cependant possible de définir un temps d’origine thermodynamique. Je montre en quoi cette dissociation du temps mécanique et du temps thermodynamique, fait écho à l’ambivalence — qui est au cœur de la physique comme de la philosophie — entre le devenir et le temps comme mesure du changement. Enfin, je suggère que la gravité quantique concourt à l’inversion de la définition aristotélicienne du temps.One of the philosophical consequences of quantum gravity on time is that time is not a dimension along which everything flows, that mechan­ical time is inappropriate and that there can be change without time. But this timelessness of quantum gravity is not the disappearance of all types of time. Indeed, a thermodynamical notion of time, that captures the notion of irreversibility, still stands in a context where there is no background metric. This might overrun an ambivalence that one finds in physics and philosophy between time as the measure of change and change itself. We conclude by conjecturing that quantum gravity might lead to the idea that change is the measure of time

Peeping into China: The Twofold Circulation of Georges Morache’s Photographs of Beijing (1865–2003)

International audienceThis article traces the circulation of photographs taken in Beijing in 1865 and 1866 by Georges Morache, a medical doctor stationed at the French legation. Including sights of the city, portraits and staged outdoor scenes depicting local trades, these pictures were disseminated from the mid-1870s in two directions simultaneously. While they were issued for about twenty-five years as wood-engraved reproductions in illustrated travel publications, they also circulated up until 2003 as prints and lantern slides within anthropological institutions. This article examines the diverse material and semiotic adaptations that these photographs were subjected to along their twofold circulation. Not only verifying the mutability of photographic meaning, this case also highlights affinities between the concerns of institutionalised anthropology, popular education and illustrated travel publications in the late nineteenth century. Ultimately, the dynamic circulation of these photographs in the West fulfilled a popular desire to scrutinise Chinese people and culture – a desire that was contingent on the informal empire upheld by western powers in China since the Opium Wars

Formulation de préconisations en vue de nouvelles modalités de conventionnement entre la Région Grand-Est et les structures de l'économie sociale et solidaire

Management et gestion public

Horace Benedict de Saussure : Professeur de philosophie à Genève, Membre de plusieurs Académies. : Dédiée à la Société des Arts de Genève

St. Ours pinxt ; Charles S. Pradier de Genève sculpt.Druckgrafik von Pradier nach einem Gemälde (1796) von St-OursAus der Sammlung Ulrich Meister (1801–1874) Exemplar der Zentralbibliothek Zürich, Graphische Sammlung und FotoarchivUnten links auf Unterlage Sammlerstempel "UM" Exemplar der Zentralbibliothek Zürich, Graphische Sammlung und Fotoarchi

Hor. Benedict de Saussure : geb. 17. Februar 1740

H. Zollinger scDruckgrafik von Zollinger nach einem Gemälde (1796) von St-Our

Différentes hypothèses concernant la prévention du cancer colorectal par les fibres alimentaires

LIMOGES-BU Médecine pharmacie (870852108) / SudocLYON1-BU Santé (693882101) / SudocSudocFranceF