Astrometry history: Hipparcos from 1964 to 1980Here follow three reports covering different aspects of the early history from 1964 to 1980 of the Hipparcos satellite mission. The first report "Interviews about the creation of Hipparcos"…Erik Høg·Apr 29, 2018SaveLearn
Die Erste Stunde (The first hour)I recall my "first hour" events following on my meeting in Fall 1968 in the classroom with my academic teacher and thesis mentor Prof. Dr. Dr. h.c. multiple Walter Greiner. My comments focus on the…Johann Rafelski·Apr 26, 2018SaveLearn
Sunspot Drawings by Japanese Official Astronomers in 1749-1750Sunspot observations with telescopes in 18th century were carried out in Japan as well. One of these sunspot observations is recorded in an account called Sansaizusetsu narabini Kansei irai Jissoku…Hisashi Hayakawa, Kiyomi Iwahashi, Masashi Fujiyama et al.·Apr 23, 2018SaveLearn
Ulugh Beg, Prince of StarsWho was Ulugh Beg? A prince who governed a province in the central Asian empire built by his grandfather Tamerlane. Above all, he was a scholar who founded the Samarkand astronomical observatory,…J. -P. Luminet·Apr 23, 2018SaveLearn
Agency and the physics of numbersAnalogous to G\"odel's incompleteness theorems is a theorem in physics to the effect that the set of explanations of given evidence is uncountably infinite. An implication of this theorem is that…John M. Myers, F. Hadi Madjid·Apr 20, 2018SaveLearn
Framework Confirmation by Newtonian AbductionThe analysis of theory-confirmation generally takes the deductive form: show that a theory in conjunction with physical data and auxiliary hypotheses yield a prediction about phenomena; verify the…Erik Curiel·Apr 20, 2018SaveLearn
On the incorrectness of the proof of the Gibbs theorem on the entropy of a mixture of ideal gases, which was given by J. W. GibbsThere is the Gibbs theorem in thermodynamics, according to which the entropy of the mixture of ideal gases is equal to the sum of the entropies of the components of the mixture. J. W. Gibbs proved…V. Ihnatovych·Apr 20, 2018SaveLearn
Comments regarding William Herschel April 1787 report of an erupting volcano on the moon: were these observations the manifestation of Impact Melt, produced by a meteorite from the Lyrid meteor shower?We consider that the report by William Herschel on April 19 and 20, 1787, about an erupting volcano on the moon were really the observations of impact melt, produced by a meteorite from the Lyrid…William Bruckman, Abraham Ruiz·Apr 19, 2018SaveLearn
Interrogating the legend of Einstein's "Biggest Blunder"It is well known that, following the emergence of the first evidence for an expanding universe, Albert Einstein banished the cosmological constant term from his cosmology. Indeed, he is reputed to…Cormac O'Raifeartaigh, Simon Mitton·Apr 18, 2018SaveLearn
Mesoscopic electron transport and atomic gases, a review of Frank W. J. Hekking's scientific workFrank W. J. Hekking performed his PhD work on "Aspects of Electron Transport in Semiconductor Nanostructures" at the TU Delft in 1992. He then worked as a postdoc at the University of Karlsruhe, the…Luigi Amico, Denis M. Basko, F Sebastián Bergeret et al.·Apr 17, 2018SaveLearn
Relation between observers and effects of number valuation in scienceThis paper is a small step towards the goal of constructing a coherent theory of physic and mathematics together. It is based on two ideas, the localization of mathematical systems in space or space…Paul Benioff·Apr 12, 2018SaveLearn
The Italian contributions to cosmic-ray physics from Bruno Rossi to the G-Stack. A new window into the inexhaustible wealth of natureFrom the late 1920s to the early 1950s, cosmic rays were the main instrument to investigate what we now call "high-energy physics". In approximately 25 years, an intense experimental and…Giulio Peruzzi, Sofia Talas·Apr 12, 2018SaveLearn
Quantum mechanics, objective reality, and the problem of consciousnessThe hard problem in consciousness is the problem of understanding how physical processes in the brain could give rise to subjective conscious experience. In this paper, I suggest that in order to…Ranjan Mukhopadhyay·Apr 10, 2018SaveLearn
A year at Sunspot. Reminiscences of 1977-1978 at the Sacramento Peak ObservatoryForty years ago I spent a year with my family at the Sacramento Peak Observatory in Sunspot, New Mexico. In August 2017 the U.S. National Solar Observatory ended its presence there with a Farewell…Rob Rutten·Apr 7, 2018SaveLearn
The emergence of space and timeResearch in quantum gravity strongly suggests that our world in not fundamentally spatiotemporal, but that spacetime may only emerge in some sense from a non-spatiotemporal structure, as this paper…Christian Wuthrich·Apr 6, 2018SaveLearn
On the wonderfulness of Noether's theorems, 100 years later, and Routh reductionThis paper is written in honour of the centenary of Emmy Amalie Noether's famous article entitled Invariante Variationsprobleme. It firstly aims to give an exposition of what we believe to be the…Raphaël Leone·Apr 5, 2018SaveLearn
Early solar photographs by G. Roster (April 1893)There are relatively few antique photographs of the Sun compared to drawings of the solar disc. We want to highlight three solar photographs taken by Giorgio Roster in 1893. Roster (1843-1894) was a…F. Domínguez-Castro, J. M. Vaquero·Apr 5, 2018SaveLearn
Aristotle, projectiles and gunsWhen guns were developed in Europe in the 14th century, the theory of projectile motion was not the one we are familiar with today due to Galileo and Newton but the one taught by Aristotle…Stephen M. Walley·Apr 2, 2018SaveLearn
Astronomy and Feng Shui in the project of the Tang, Ming and Qing royal mausoleums: a satellite imagery approachThe royal Chinese mausoleums of the Tang, Ming and Qing Chinese dynasties are astounding ensables of monuments, conceived and built to assure to the Emperors immortality in the afterlife and…Giulio Magli·Apr 1, 2018SaveLearn
The Traveling-Wave Tube in the History of TelecommunicationThe traveling-wave tube is a critical subsystem for satellite data transmission. Its role in the history of wireless communications and in the space conquest is significant, but largely ignored, even…Damien Minenna, Frédéric André, Yves Elskens et al.·Mar 30, 2018SaveLearn
History of the NeoClassical Interpretation of Quantum and Relativistic PhysicsThe need for revolution in modern physics is a well known and often broached subject, however, the precision and success of current models narrows the possible changes to such a great degree that…Shiva Meucci·Mar 30, 2018SaveLearn
Kant, Schlick and Friedman on Space, Time and Gravity in Light of Three Lessons from Particle PhysicsKantian philosophy of space, time and gravity is significantly affected in three ways by particle physics. First, particle physics deflects Schlick's General Relativity-based critique of synthetic a…J. Brian Pitts·Mar 29, 2018SaveLearn
Introduction to Volume 15 of The Collected Papers of Albert Einstein. The Berlin Years: Writings and Correspondence June 1925 - May 1927This volume covers one of the most thrilling two-year periods in twentieth-century physics, as matrix mechanics - developed chiefly by W. Heisenberg, M. Born, and P. Jordan - and wave mechanics -…Diana Kormos Buchwald, József Illy, A. J. Kox et al.·Mar 28, 2018SaveLearn
Incompleteness theorem for physicsWe show how G\"odel's first incompleteness theorem has an analog in quantum theory. G\"odel's theorem implies endless opportunities for appending axioms to arithmetic, implicitly showing a role for…John M. Myers, F. Hadi Madjid·Mar 27, 2018SaveLearn
Diffuse matter and cosmogony of stellar systems in researches by ShajnThe main topic of long-term researches by G.A. Shajn is the nature of diffuse matter, its distribu-tion in the Galaxy and extragalactic systems, interaction with the interstellar medium and hot…N. I. Bondar·Mar 26, 2018SaveLearn