Yoshikatsu Sugiura's Contribution to the Development of Quantum Physics in Japan

Previous research in the history of physics has led us to believe that Yoshio Nishina (1890–1951) virtually single‐handedly imported quantum physics into Japan. However, there are first‐hand accounts that Yoshikatsu Sugiura (1895–1960) also played an important role. Sugiura made his name in quantum chemistry with his contribution to the Heitler‐London theory of the chemical bond. Yet, historians of physics have paid scant attention to him. This paper brings forward information on Sugiura from his letters, his scientific papers, and his own recollections until ca. 1930. By examining this material, the present paper studies Sugiura's accomplishments in Europe and his contributions to the development of quantum physics in Japan. We conclude that Sugiura was one of the most important physicists when it comes to the arrival of quantum physics in Japan. In addition, we assess why he has been under‐appreciated in the history of physics in Japan. Our historical study on Sugiura suggests that, in addition to the position Nishina and his students rightfully occupy, there still are important unexplored aspects in the history of Japanese quantum physics.     

Tom Stoppard’s Big Picture: The Chaos that is Our World

Abstract

Issues arising from discussions regarding the ‘two cultures’ of science and art are many and varied. Tom Stoppard’s very active utilization of science in many of his plays has resulted in his work — especially the quantum mechanics-informed Hapgood and the chaotics-informed Arcadia — being held up as paradigmatic of one science/art position or another. Often, critical approaches to these plays involve a checklist of scientific facts, implying that the goal of such art is to serve as a delivery device for scientific breakthroughs. While plays, novels, and movies of various sorts may have such goals in mind, Stoppard’s plays do not comfortably fill that agenda, critical arguments to the contrary notwithstanding. Neither do Stoppard’s plays show particular interest in engaging any debate about the superiority of one ‘culture’ over the other. In his two ‘science plays’ in particular, what Stoppard offers is an enrichment of both science and art through metaphorical intertwinings that suggest experience is best served when both camps collaborate. The bigger picture that results argues an overlap in epistemology, namely revealing the uncanny similarity in which artist and scientist approach the material that is our universe.     

Measuring use-related fracture velocity in lithic armatures to identify spears,javelins, darts,and arrows

This study employs a brittle fracture-mechanics-based approach to explore the relationship between lithic fracture velocity and precursory loading rate in fine-grained lithic armatures. The data demonstrate that only high-speed dart and arrow armatures are subject to dynamic loading events, whereas spear and javelin armatures are limited to rapid (and quasi-static) loading. The data presented were derived from controlled experiments employing spears, javelins, spearthrower darts, and arrows. Armatures associated with both bow and spearthrower technologies are reliably identified and distinguished from those of low-speed technologies such as spears and javelins. Javelin armatures may also sustain higher velocity fractures than spear armatures, thus permitting the further differentiation of these technologies. The methodology offers a quantitative, non-subjective means to identify the delivery technology associated with a lithic armature.     

Estimating original flake mass from 3D scans of platform area

This study confirms the increased capacity to predict flake mass that arises from more accurately measuring surface area in three dimensions using a digital scanner. We also reveal the existence of significantly different relationships between platform area and flake mass for flakes with different platform types and ventral and dorsal morphologies. These different relationships between platform surface area and mass have not been previously identified, and reveal the complexity of platform/mass relationships. Using multivariate regression of 3D platform surface area and external platform angle we improve the accuracy of predictions of original flake mass. We propose a method for studying reduction intensity on retouched flakes, based on comparing predictions of the initial mass of the flake with measurements of the mass following retouching to estimate the amount of mass removed through retouching. We name this approach the Initial-/Terminal-Mass Comparison, or ITMC. Our experiments demonstrate that the capacity of the 3D platform scans to predict flake mass, and by implication the capacity of the ITMC to estimate mass loss, rivals or exceeds the capacity demonstrated for existing reduction measures.     

“Lachkabinett” und “großes Fest” der Physiker. Walter Grotrians “physikalischer Einakter” zu Max Plancks 80. Geburtstag

“Funhouse” and “Big Celebration” of the Physicists. Walter Grotrian's ?Physical One‐Act Play”? for Max Planck's 80th Birthday. On the occasion of Max Planck's 80th birthday on April 23, 1938, a “big celebration of the physicists” (großes Fest der Physiker) was celebrated at the Harnack‐House in Berlin. The festivities were organized by the German Physical Society. Part of the ceremony was a “Physical One‐act‐play” (Physikalischer Einakter) written by the Potsdam astrophysicist Walter Grotrian. The actors of the humorous play were chief protagonists in the development of quantum theory such as Debye, Sommerfeld and Heisenberg. In this essay we analyze Grotrian's drama against the background of both the festive event and the professional and social setting of the physicists. We argue that below the level of comedy a number of characteristic and normally unexpressed aspects of the epistemic culture of the German physics by the end of the nineteen‐thirties is treated in the play.     

Schooling the Quantum Generations: Textbooks and Quantum Cultures from the 1910s to the 1930s

Ever since Thomas Kuhn's influential The Structure of Scientific Revolutions (1962), textbooks have suffered a bad reputation. They have been accused of distorting—at times purportedly—history and of feeding students with an unacceptably simplified and optimistic view of science. This attitude started to change only in recent times. With the increase of attention paid not only to how theories are conceived, but also how they are practiced, disseminated, and appropriated, historians have rehabilitated textbooks as a legitimate site of knowledge production. In this paper, I adopt textbooks as an instrument to unfold multiple facets of the culture that allowed quantum physics to flourish between 1900 and the early 1930s. I organize the article around two stories about two major textbooks, i.e., Sommerfeld′s Atombau und Spektrallinien and Dirac′s Principles of Quantum Mechanics. I explore the complex pedagogical cultures underlying these two masterpieces and how they intersect local agendas.     

Quantum Cultures during the Prehistory of Quantum Gravity: Léon Rosenfeld's Early Contributions to Quantum Gravity

In this paper we consider the prehistory of quantum gravity (1916–1930) from two perspectives. First, we investigate how this research field constituted itself and we propose for the first time a red thread to trace its evolution in this earliest period. Second, we focus on a case study: the earliest work of Léon Rosenfeld. In 1927 he tried to merge wave mechanics with general relativity in the context of a five‐dimensional universe. We describe how Oskar Klein, Louis de Broglie, and Théophile De Donder influenced Rosenfeld's work and analyze how and why Rosenfeld attempted to reconcile Einstein's theory with quantum phenomena. We argue that Rosenfeld investigated for the first time the corrections to a classical space‐time metric generated by a quantum source. As far as we know, Rosenfeld's approach has been largely ignored until today: he himself considered it “an accident.” After having reconsidered its connection with de Broglie's ideas and Rosenfeld's interpretation of the wave function in 1927, we argue that Rosenfeld's work can be interpreted as a first attempt to introduce the pilot‐wave theory in the context of quantum gravity and we infer that this was one of the reasons that ruled it out.     

From War 2.0 to quantum war: the superpositionality of global violence

As information networks catalyse local incidents into international crises, as global events appear and disappear on multiple screens at an accelerated pace and as a war of images displaces the image of war, it becomes increasingly difficult to understand the rapidly changing nature of global violence within the confines of security studies. Phase-shifting with each media intervention from states to sub-states, local to global, public to private, organised to chaotic and virtual to real—and back again—global violence superpositions into a quantum war that requires new transdisciplinary, transnational and transmedial approaches.     

Origins of Molecular Neurobiology: The Role of the Physicists

The revolution in the foundations of physics at the beginning of the twentieth century suggested to several of its most prominent workers that biology was ripe for something similar. In consequence, a number of physicists moved into biology. They were highly influential in initiating a molecular biology in the 1950s. Two decades later it seemed to several of these migrants, and those they had influenced, that the major problems in molecular biology had been solved, and that it was time to move on to what seemed to them the final problem: the nervous system, consciousness, and the age-old mind-body problem. This paper reviews this “double migration” and shows how the hopes of the first generation of physicist-biologists were both realized and dashed. No new physical principles were discovered at work in the foundations of biology or neuroscience. On the other hand, the mind-set of those trained in physics proved immensely valuable in analyzing fundamental issues in both biology and neuroscience. It has been argued that the outcome of the molecular biology of the 1950s was a change in the concept of the gene from that of “a mysterious entity into that of a real molecular object” (Watson, 1965 Watson, JD. 1965. The Molecular Biology of the Gene, New York: Benjamin.  [Google Scholar], p.6); the gates and channels which play such crucial roles in the functioning of nervous systems have been transformed in a similar way. Studies on highly simplified systems have also opened the prospect of finding the neural correlatives of numerous behaviors and neuropathologies. This increasing understanding at the molecular level is invaluable not only in devising rational therapies but also, by defining the material substrate of consciousness, in bringing the mind-body problem into sharper focus.