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Signed by:Professor Freeman Dyson
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Freeman John Dyson, (15 December 1923 – 28 February 2020) was a British-American theoretical physicist and mathematician known for his works in quantum field theory, astrophysics, random matrices, mathematical formulation of quantum mechanics, condensed matter physics, nuclear physics, and engineering. He was professor emeritus at the Institute for Advanced Study in Princeton and a member of the board of sponsors of the Bulletin of the Atomic Scientists.RARE Hand Autographed Signed Institute for Advanced Studies Business Card Excellent Condition. Dyson originated several concepts that bear his name, such as the Dyson transform, a fundamental technique in addictive number theory which he developed as part of his proof of Mann’s theorem, the Dyson tree, a hypothetical genetically engineered plant capable of growing in a comet; the Dyson series, a perturbative series where Feynman diagrams represent each term; the Dyson sphere, a thought experiment that attempts to explain how a space-faring civilization would meet its energy requirements with a hypothetical megastructure that completely encompasses a star and captures a large percentage of its power output; and Dyson’s eternal intelligence, a means by which an immortal society of intelligent beings in an open universe could escape the prospect of the heat death of the universe by extending subjective time to infinity while expending only a finite amount of energy. Dyson disagreed with the scientific consensus on climate change. He believed that some of the effects of increased CO2 levels are favorable and not taken into account by climate scientists, such as increased agricultural yield, and further that the positive benefits of CO2 likely outweigh the negative effects He was skeptical about the simulation models used to predict climate change, arguing that political efforts to reduce causes of climate change distract from other global problems that should take priority. On G.I. Taylor’s advice and recommendation, Dyson moved to the United States in 1947 as a Commonwealth Fellow for postgraduate study with Hans Bethe at Cornell University (1947–1948). There he made the acquaintance of Richard Feynman. Dyson recognized the brilliance of Feynman and worked with him. He then moved to the Institute for Advanced Study (1948–1949), before returning to England (1949–51), where he was a research fellow at the University of Birmingham. In 1949, Dyson demonstrated the equivalence of two formulations of quantum electrodynamics (QED): Richard Feynman’s diagrams and the operator method developed by Julian Schwinger and Shin’ichro Tomonaga. He was the first person after their creator to appreciate the power of Feynman diagrams and his paper written in 1948 and published in 1949 was the first to use them. He said in that paper that Feynman diagrams were not just a computational tool but a physical theory and developed rules for the diagrams that completely solved the renormalization problem. Dyson’s paper and lectures presented Feynman’s theories of QED in a form other physicists could understand, facilitating the physics community’s acceptance of Feynman’s work. J. Robert Oppenheimer, in particular, was persuaded by Dyson that Feynman’s new theory was as valid as Schwinger’s and Tomonaga’s. Also in 1949, in related work, Dyson invented the Dyson series, which inspired John Ward to derive his celebrated Ward-Takahashi identity. Dyson joined the faculty at Cornell as a physics professor in 1951, though he still had no doctorate. In December 1952, Oppenheimer, the director of the Institute for Advanced Study in Princeton New Jersey, offered Dyson a lifetime appointment at the institute, “for proving me wrong”, in Oppenheimer’s words. Dyson remained at the Institute until the end of his career. In 1957 he became a U.S. citizen. From 1957 to 1961 Dyson worked on Project Orion, which proposed the possibility of space flight using nuclear pulse propulsion. A prototype was demonstrated using conventional explosives, but the 1963 Partial Test Ban Treaty, in which Dyson was involved and which he supported, permitted only underground nuclear weapons testing. and the project was abandoned in 1965. In 1958 Dyson was a member of the design team under Edward Teller for TRIGA, a small, inherently safe nuclear reactor used throughout the world in hospitals and universities for the production of medical isotopes. In 1966, independently of Elliott H. Lieb and Walter Thirring, Dyson and Andrew Lenard published a paper proving that the Pauli exclusion principle plays the main role in the stability of matter. Hence it is not the electromagnetic repulsion between outer-shell orbital electrons that prevents two stacked wood blocks from coalescing into a single piece, but the exclusion principle applied to electrons and protons that generates the classical macroscopic normal force. In condensed matter physics, Dyson also analyzed the phase transition of the Ising model in one dimension and spin waves. The net proceeds are donated between two different dog rescues. Thank you for your support. ALL MY ITEMS SOLD HAVE A 100% UNCONDITIONAL MONEY-BACK GUARANTEE
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