Julian Schwinger Autograph Letter Signed.

Rare original autograph letter signed by Nobel Prize-winning theoretical physicist Julian Schwinger to Turkish physicist Behram Kursonoglu. One page, on Institut des Hautes Etudes Scientifiques stationery, dated January 6, and addressed to Kursonoglu. The letter is regarding Schwinger offering an affirmative response to an invitation to attend the conference on Symmetry Principles at High Energy. The recipient, Behram Kurşunoğlu (1922â€"2003), was a Turkish theoretical physicist whose career made him one of the most internationally connected and institutionally consequential scientists produced by the Republic of Turkey in the twentieth century. Born in the small town of Çaykara on Turkey’s border with Georgia, he was sent on scholarship to the University of Istanbul, where he graduated in 1945, before proceeding on a Turkish government scholarship to the University of Edinburgh â€" his arrival in London in August 1945 coinciding with the news of the bombing of Hiroshima, an event he later recalled as defining his sense of the moral stakes of theoretical physics. He pursued postdoctoral work under Paul Dirac at Cambridge â€" a mentorship that shaped his lifelong preoccupation with unified field theory â€" before joining the University of Miami as a professor of physics in 1958 and founding its Center for Theoretical Studies in 1965, which he directed until 1992 and which he built into a genuine mecca for theoretical physics, hosting Nobel laureates including Dirac, Lars Onsager, and Robert Hofstadter. He organized the celebrated annual Coral Gables Conferences beginning in 1964, which brought together leading scientists from across the world and established South Florida as an unlikely but genuine node in the international network of theoretical physics. He also participated in the discovery of two different types of neutrinos in the late 1950s, served as a founding member of the Turkish Atomic Energy Commission, and received the Turkish Presidential Science Prize in 1972. His most significant scholarly contribution â€" his generalization of Einstein’s unified field theory incorporating a fundamental length parameter â€" occupied him throughout his career and reflected a characteristically ambitious attempt to reconcile gravitation with the quantum world that few of his contemporaries were willing to pursue with equal persistence. In near fine condition with mail folds. The piece measures 8.25 inches by 10.5 inches. Julian Seymour Schwinger (1918â€"1994) was an American theoretical physicist whose contributions to quantum electrodynamics â€" the quantum field theory describing the interactions between light and matter â€" rank among the most mathematically sophisticated and intellectually formidable achievements in the history of modern physics. Born in New York City to a Jewish family of Romanian and Polish descent, Schwinger displayed such precocious mathematical ability that he was publishing original research in physics by the age of sixteen and completed his doctorate at Columbia University under Isidor Isaac Rabi at the age of twenty-one. During the Second World War he made fundamental contributions to radar theory and the development of microwave technology at the MIT Radiation Laboratory, work whose practical significance was matched only by the theoretical advances it inspired. His postwar reformulation of quantum electrodynamics developed independently and simultaneously with Richard Feynman and Sin-Itiro Tomonaga earned the three men the Nobel Prize in Physics in 1965. Where Feynman's approach relied on the intuitive visual language of Feynman diagrams, Schwinger worked in a dense operator formalism that reflected his belief that physics should be expressed through rigorous mathematical structures rather than pictorial shortcuts â€" a stylistic divergence that has led some historians of science to argue that Feynman's more accessible methods ultimately displaced Schwinger's in the pedagogical tradition despit.