Chronicle of the discovery of the back-bending phenomenon in atomic nuclei: a personal recollection 50 years onA chronicle describing the historical context and the development of ideas and experiments leading to the discovery of the back-bending phenomenon in rapidly rotating atomic nuclei some 50 years ago…Hans Ryde·Sep 17, 2021SaveLearn
Substantive general covariance and the Einstein-Klein dispute: A Noetherian approachFamously, Klein and Einstein were embroiled in an epistolary dispute over whether General Relativity has any physically meaningful conserved quantities. In this paper, we explore the consequences of…Laurent Freidel, Nicholas Teh·Sep 16, 2021SaveLearn
Life in a random universe: Sciama's argument reconsideredRandom sampling in high dimensions has successfully been applied to phenomena as diverse as nuclear resonances, neural networks and black hole evaporation. Here we revisit an elegant argument by the…Zhi-Wei Wang, Samuel L. Braunstein·Sep 10, 2021SaveLearn
Reasons, Persons, and PhysicsStarting from general considerations, some ideas of the philosopher Derek Parfit on consciousness, self-awareness, and reductionism are briefly reviewed and critically examined from the standpoint of…Luiz Carlos Ryff·Sep 9, 2021SaveLearn
General Relativity's energy and positivity -- a brief historyI give a brief review of the search for a proper definition of energy in General Relativity (GR), a far from trivial quest, which was only completed after four and a half decades. The equally (or…S. Deser·Sep 8, 2021SaveLearn
Searching for the Feynman diagram IIcThe calculation of the electron g-factor was carried out in 1950 by Karplus and Kroll. Seven years later, Petermann detected and corrected a serious error in the calculation of a Feynman diagram.…Oliver Consa·Sep 7, 2021SaveLearn
Limits on Relativistic Quantum MeasurementRequiring causality on measurements in quantum field theory seems to impose strong conditions on a self-adjoint operator to be really measurable. This may seem limiting and artificial in the operator…Jonáš Fuksa·Sep 7, 2021SaveLearn
Bridging the neuroscience and physics of timeAs a neuroscientist and a theoretical physicist, both working on time, we have decided to open a direct dialogue to examine if the apparent discrepancies regarding the nature of time can be composed.Dean Buonomano, Carlo Rovelli·Sep 5, 2021SaveLearn
Beyond method: The diatribe between Feyerabend and Popper over the foundations of quantum mechanicsKarl Popper and Paul Feyerabend have been among the most influential philosophers of science of the twentieth century. Extensive studies have been dedicated to the development of their controversial…Flavio Del Santo·Aug 30, 2021SaveLearn
Investigation of a water turbine built according to Euler's proposals (1754)This is an annotated translation from German of Untersuchung einer nach den Euler'schen Vorschlagen (1754) gebauten Wasserturbine [Investigation of a water turbine built according to Euler's…Sylvio R Bistafa·Aug 26, 2021SaveLearn
An Algebraic Approach to Physical FieldsAccording to the algebraic approach to spacetime, a thoroughgoing dynamicism, physical fields exist without an underlying manifold. This view is usually implemented by postulating an algebraic…Lu Chen, Tobias Fritz·Aug 16, 2021SaveLearn
"That Star Is Not on the Map": The German Side of the discoveryNeptune was telescopically discovered by Johan Gottfried Galle and Heinrich Louis d'Arrest in Berlin on 23 September 1846 based on the prediction by Urbain Jean Joseph Le Verrier. The role German…Davor Krajnović·Aug 13, 2021SaveLearn
James Clerk Maxwell on quantities and unitsIn the scientific literature the equation Q=\Q\[Q] is frequently quoted, where Q denotes a quantity, \Q\ a numerical value, and [Q] a unit. During the last years some experts claimed,…Michael P. Krystek·Aug 13, 2021SaveLearn
Indeterministic finite-precision physics and intuitionistic mathematicsIn recent publications in physics and mathematics, concerns have been raised about the use of real numbers to describe quantities in physics, and in particular about the usual assumption that…Tein van der Lugt·Aug 12, 2021SaveLearn
Constelaciones mayas: Visualizaci\'on e interpretaci\'on utilizando herramientas inform\'aticasThere has been a long standing debate about the existence of maya constellations, but there are several sources of evidences that favour this hypothesis: mural paintings, stelae and codex. In this…Eduardo Rodas-Quito, Javier Mejuto·Aug 4, 2021SaveLearn
How a fake Kepler portrait became iconicFor several decades a portrait of Johannes Kepler has been widely circulating among professional astronomers, scientific and academic institutions, and the general public. Despite its provenance and…Steven N. Shore, Václav Pavlík·Aug 4, 2021SaveLearn
The Devil in the (Implicit) Details. On the AMPS Paradox and its ResolutionThe black hole information loss paradox has long been one of the most studied and fascinating aspects of black hole physics. In its latest incarnation, it takes the form of the firewall paradox. In…Enrico Cinti, Marco Sanchioni·Aug 4, 2021SaveLearn
Spacetime is materialSpace and time are central concepts for understanding our World. They are important ingredients at the core of every scientific theory and subject of intense debate in philosophy. Albert Einstein's…Luciano Combi·Aug 3, 2021SaveLearn
Traduction comment\'ee en francais de la Conf\'erence Bakerienne Sur le M\'ecanisme de l'Oeil de Thomas Young (1800)On November 27, 1800, Thomas Young presents for the second time to the Royal Society of London his theory of the musclurity of the crystalline lens, as being the cause of the accommodation of the eye…Olivier Morizot·Jul 29, 2021SaveLearn
Traduction commment\'ee en francais de La Conf\'erence Bakerienne sur la Th\'eorie de la Lumi\`ere et des Couleurs de Thomas YoungOn November 12, 1802, Thomas Young lays down in front of the Royal Society of London his Theory of Light and Colours. In this text, he defends a vibratory model or light, in which the peculiar…Olivier Morizot·Jul 29, 2021SaveLearn
Euler Analysis of a Machine for Raising Waters Proposed by Mr. de MourWe revisited an analysis made by Euler in a memoir of 1753 'Sur une nouvelle maniere d'elever de l'eau propose par M. de Mour' (On a new method to raise water proposed by Mr. de Mour), addressing a…Sylvio R. Bistafa·Jul 26, 2021SaveLearn
A Commentary on The Knowledge Machine by Michael StrevensWe offer a few comments derived from a careful reading of Michael Strevens' book The Knowledge Machine (TKM), with an emphasis on extensions for future work. We believe this book goes well…Manuel Ortega-Rodríguez·Jul 24, 2021SaveLearn
What? Who? Why? StellifyIn his 1981 article, Roberts highlights the term 'stellify' defined as "to transform (a person or thing) into a star or constellation, to place among the stars." Using the case of the Tabwa people of…Jarita Holbrook·Jul 22, 2021SaveLearn
Noether's first theorem and the energy-momentum tensor ambiguity problemNoether's theorems are widely praised as some of the most beautiful and useful results in physics. However, if one reads the majority of standard texts and literature on the application of Noether's…Mark Robert Baker, Niels Linnemann, Chris Smeenk·Jul 21, 2021SaveLearn
Do gravitational waves confirm Hawking's area law?Recently an experiment has been performed for the purpose of "testing the area law with GW150914". As the experimenters put it, the experiment presents "observational confirmation" of Hawking's area…Galina Weinstein·Jul 21, 2021SaveLearn