Yves Gingras

We describe here a series of experimental analogies between fluid mechanics and quantum mechanics recently discovered by a team of physicists. These analogies arise in droplet systems guided by a surface (or pilot) wave. We argue that these experimental facts put ancient theoretical work by Madelung on the analogy between fluid and quantum mechanics into new light. After re-deriving Madelung’s result starting from two basic fluid-mechanical equations (the Navier-Stokes equation and the continuity equation), we discuss the relation with the de Broglie-Bohm theory. This allows to make a direct link with the droplet experiments. It is argued that the fluid-mechanical interpretation of quantum mechanics, if it can be extended to the general N-particle case, would have an advantage over the Bohm interpretation: it could rid Bohm’s theory of its strongly non-local character.

This article uses the methods of citation and network analysis to map the global structure of the intellectual field and its development over time. Through the case study of Mersenne's, Oldenburg's and Darwin's correspondences, we show how looking at letters as a corpus of data can provide a global representation of the evolving conversation going on in the Republic of Letters and in intellectual and scientific fields. Aggregating general correspondences in electronic format offers a global portrait of the evolving composition of the intellectual and scientific scene, its changing foci of interests and the fortune of the intellectual discussions as expressed in cited persons in the letters. Such tools help replace a purely metaphoric use of the term “network” by a visible map of the intellectual relations between people on which well defined calculations of the centrality of the positions of different actors can be made as well as their evolution over time. These techniques provide welcome additions to the tool kit of scholars in an age where the computer and the web offer new ways of mapping and mining the rich store of information contained in intellectual correspondences. ☆ I would like to thank Alain Couillard for the production of the figures and Vincent Larivière and the anonymous referees of the journal for useful comments and suggestions on an earlier version of this paper. Thanks also to the many comments received over the last 10 years as I presented preliminary results of this research at the REHSEIS research center of Université of Paris VII in 1999, the Dibner Institute for the History of Science and Technology at MIT in 2000, at Pietro Corsi's seminar at Oxford University in 2007 and at the History Department of Ottawa University in 2010.

We describe a series of experimental analogies between fluid mechanics and quantum mechanics recently discovered by a team of physicists. These analogies arise in droplet systems guided by a surface wave. We argue that these experimental facts put ancient theoretical work by Madelung on the analogy between fluid and quantum mechanics into new light. After re-deriving Madelung’s result starting from two basic fluid mechanical equations, we discuss the relation with the de Broglie–Bohm theory. This allows to make a direct link with the droplet experiments. It is argued that the fluid mechanical interpretation of quantum mechanics, if it can be extended to the general N-particle case, would have a considerable advantage over the Bohm interpretation: it could rid Bohm’s theory of its non-local character.

L’intensification récente des relations entre les acteurs du champ universitaire et ceux du monde industriel a amené une montée en visibilité des questions qui touchent les conflits d’intérêts. Pratiquement toujours entendue comme une catégorie intemporelle et universelle, la notion de « conflit d’intérêts » a cependant une genèse historique et des conditions sociales d’émergence. À travers plusieurs exemples canadiens et américains du vingtième siècle, cet article montre comment émergent les conflits d’intérêts dans le champ universitaire. Alors qu’aujourd’hui ces exemples seraient probablement perçus et dénoncés comme des cas flagrants de conflits d’intérêts, cela ne semble pas avoir été le cas à l’époque. En fait, le « conflit d’intérêts » suppose d’abord l’existence d’intérêts en conflits, eux-mêmes portés par des agents qui ont intérêt à percevoir, et parfois même à générer, ces conflits.