Paul Dirac Autograph Letter Signed.

Rare original autograph letter signed by British theoretical physicist Paul Dirac to Turkish physicist Behram Kursonoglu. One page, on Department of Physics, Florida State University letterhead, FSU watermark, and dated October 22, 1973. The letter is regarding Dirac comparing Kursonoglu's field theory with his own, with several technical remarks. The recipient, Behram Kurşunoğlu (1922–2003), 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 — 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 — a mentorship that shaped his lifelong preoccupation with unified field theory — 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 — his generalization of Einstein's unified field theory incorporating a fundamental length parameter — 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 fine condition with mail folds. The piece measures 8.5 inches by 11 inches.