Euler’s interpretation of Newton’s gravity (NG) as Archimedes’ thrust in a fluid ether is presented in some detail. Then a semi-heuristic mechanism for gravity, close to Euler’s, is recalled and compared with the latter. None of these two ‘‘gravitational ethers’’ can obey classical mechanics. This is logical since the ether defines the very reference frame, in which mechanics is defined. This concept is used to build a scalar theory of gravity: NG corresponds to an incompressible ether, a compressible ether leads (...) to gravitational waves. In the Lorentz–Poincaré version, special relativity is compatible with the ether, but, with the heterogeneous ether of gravity, it applies only locally. A correspondence between metrical effects of uniform motion and gravitation is assumed, yet in two possible versions (one is new). Dynamics is based on a (non-trivial) extension of Newton’s second law. The observational status for the theory with the older version of the correspondence is summarized. (shrink)

An analysis of the classical-quantum correspondence shows that it needs to identify a preferred class of coordinate systems, which defines a torsionless connection. One such class is that of the locally-geodesic systems, corresponding to the Levi-Civita connection. Another class, thus another connection, emerges if a preferred reference frame is available. From the classical Hamiltonian that rules geodesic motion, the correspondence yields two distinct Klein-Gordon equations and two distinct Dirac-type equations in a general metric, depending on the connection used. Each of (...) these two equations is generally-covariant, transforms the wave function as a four-vector, and differs from the Fock-Weyl gravitational Dirac equation (DFW equation). One obeys the equivalence principle in an often-accepted sense, whereas the DFW equation obeys that principle only in an extended sense. (shrink)

In this short paper we analyse some paradoxical aspects of France’s Foucauldian heritage: while several French scholars claim the COVID-19 pandemic is a perfect example of what Foucault called biopolitics, popular reaction instead suggests a biopolitical failure on the part of the government; One of these failures concerns the government’s inability to produce reliable biostatistical data, especially regarding health inequalities in relation to COVID-19. We interrogate whether Foucaldianism contributed, in the past as well today, towards a certain myopia in France (...) regarding biostatistics and its relation to social inequalities in health. One might ask whether this very data could provide an appropriate response to the Foucauldian question: What kind of governance of life is the pandemic revealing to us? (shrink)

Physiologists and historians are still debating what conceptually differentiates each of the three major modern theories of regulation: the constancy of the milieu inte´rieur, homeostasis and allostasis. Here I propose that these models incarnate two distinct regimes of politization of the life sciences.This perspective leads me to suggest that the historicization of physiological norms is intrinsic to the allostatic model, which thus divides it fundamentally from the two others. I analyze the allostatic model in the light of the Canguilhemian theory, (...) showing how the former contributed to the development of a critical epistemology immune to both naturalist essentialism and social constructivism. With a unique clarity in the history of physiology, allostasis gives us a model of the convergence of historical epistemology and scientific practice. As such it played a key role in codifying the epistemological basis of certain current research programs that, in the fields of social epidemiology and feminist neuroscience, promote what we name here a critical physiology. (shrink)