scholarly journals Shifting Standards: Experiments in Particle Physics in the Twentieth CenturyShifting Standards: Experiments in Particle Physics in the Twentieth Century, Allan Franklin, U. Pittsburgh Press, 2013. $50.00 (360 pp.). ISBN 978-0-8229-4430-0

Physics Today ◽  
2014 ◽  
Vol 67 (10) ◽  
pp. 52-52
Author(s):  
Paul Halpern
2016 ◽  
Vol 62 ◽  
pp. 59-88 ◽  
Author(s):  
Ian J. R. Aitchison ◽  
Sir Chris Llewellyn Smith

Richard (Dick) Henry Dalitz was a theoretical physicist whose principal contributions were intimately connected to some of the major breakthroughs of the twentieth century in particle and nuclear physics. His formulation of the ‘τ–θ’ puzzle led to the discovery that parity is not a symmetry of nature—the first of the assumed space-time symmetries to fail. He pioneered the theoretical study of hypernuclei, of strange baryon resonances, and of baryon spectroscopy in the quark model (at a time when many considered it ‘naive’), to all of which he made lasting contributions. The ‘Dalitz plot’ and ‘Dalitz pairs’ are part of the vocabulary of particle physics. Throughout his career he remained in close touch with many experimentalists, and he had an encyclopaedic knowledge of the data. Many of his papers were stimulated by experimental results and were concerned with their analysis and interpretation, work that often required the forging of new phenomenological tools; many also indicated what new experiments needed to be done. As a consequence, he was a theorist exceptionally valued by experimentalists. He created and ran a strong particle theory group at Oxford, which attracted many talented students and researchers, and which has continued to thrive.


2015 ◽  
Vol 45 (4) ◽  
pp. 513-548 ◽  
Author(s):  
Thomas Heinze ◽  
Olof Hallonsten ◽  
Steffi Heinecke

In its fifty-year history, the German national research laboratory DESY (Deutsches Elektronen-Synchrotron, German Electron Synchrotron) has undergone a gradual transformation from a single-mission particle physics laboratory to a multi-mission research center for accelerator physics, particle physics, and photon science. The last is an umbrella term for research using synchrotron radiation and, in later years, free-electron laser. Synchrotron radiation emerged initially as a peripheral part of the laboratory activities but grew to become a central experimental activity at DESY via a series of changes in the organizational, scientific, and infrastructural setup of the lab, and in its contextual scientific, political, and societal environment. Together with an earlier publication on the issue in this journal,1 this article chronicles the first thirty years in the history of synchrotron radiation at DESY. The focus is on the gradual transformation of DESY’s research program in synchrotron radiation from peripheral and parasitic into mainstream and mission. We provide insights about the crucial renewal of Big Science laboratories toward the end of the twentieth century. This renewal culminated in the close-down of several particle physics machines in the early 2000s and their replacement by facilities dedicated to the study of the structure, properties, and dynamics of matter by the interaction with vacuum ultraviolet and X-ray photons. Therefore, we contribute to better understanding the growth of synchrotron radiation as a laboratory resource, and processes of renewal in Big Science as part of the general history of late-twentieth-century science.


2016 ◽  
Vol 42 (1) ◽  
pp. 4-24 ◽  
Author(s):  
Louise Amoore

The architecture of cloud computing is becoming ever more closely intertwined with geopolitics – from the sharing of intelligence data, to border controls, immigration decisions, and drone strikes. Developing an analogy with the cloud chamber of early twentieth century particle physics, this paper explores the geography of the cloud in cloud computing. It addresses the geographical character of cloud computing across two distinct paradigms. The first, ‘ Cloud I’ or a geography of cloud forms, is concerned with the identification and spatial location of data centres where the cloud is thought to materialize. Here the cloud is understood within a particular history of observation, one where the apparently abstract and obscure world can be brought into vision and rendered intelligible. In the second variant, ‘ Cloud II’ or the geography of a cloud analytic, the cloud is a bundle of experimental algorithmic techniques acting upon the threshold of perception itself. Like the cloud chamber of the twentieth century, contemporary cloud computing is concerned with rendering perceptible and actionable that which would otherwise be beyond the threshold of human observation. The paper proposes three elements of correlative cloud reasoning, suggesting their significance for our geopolitical present: condensing traces; discovering patterns; and archiving the future.


Author(s):  
Demetris Nicolaides

Empedocles managed to reconcile the antinomies between the Heraclitean becoming (the constant change) and the Parmenidean Being (the constancy) by introducing four unchangeable primary substances of matter: earth, water, air, and fire, later called elements, and two types of forces, love and strife. Change was produced when the opposite action of the forces mixed and separated the unchangeable elements in many different ways, an idea in basic agreement with modern chemistry or, more fundamentally, with the standard model of particle physics. Everlasting cosmological cycles, described in his unique cosmology, could have addressed successfully the deceptively simple question, Why is the sky dark at night? (known as Olbers’s paradox), before the cosmology of the big bang had it figured out in the twentieth century. Four primary substances of matter for Empedocles, but infinitely many for the mind of Anaxagoras, and everything is in everything.


2001 ◽  
Vol 16 (04) ◽  
pp. 483-502 ◽  
Author(s):  
JAMES D. BJORKEN

After a very brief review of twentieth century elementary particle physics, prospects for the next century are discussed. First and most important are technological limits of opportunities; next, the future experimental program, and finally the status of the theory, in particular its limitations as well as its opportunities.


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