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Achilles Papapetrou
Achille Papapetrou ((ギリシア語:Αχιλλέας Νικολάου Παπαπέτρου); 1907–1997) was a Greek-French theoretical physicist, who contributed to the Theory of General Relativity. He is known for the Mathisson−Papapetrou−Dixon equations,〔.〕 the Majumdar−Papapetrou solutions,〔Papapetrou, A. (1948): "A static solution of the equations of the gravitational field for an arbitrary charge distribution", ''Proc. Roy. Irish Acad.'' A 51 191.〕 and the Weyl−Lewis−Papapetrou coordinates of gravity theory.
He worked on exact solutions of Einstein's field equations and long sought a solution for rotating masses, which, however, were only found by Roy Kerr. Papapetrou was then the first who recognized and jubilantly welcomed Kerr's breakthrough announced at the Texas Symposium on Relativistic Astrophysics, Dallas, December 1963.〔Thorne, K. S. (1994): ''Black holes and time warps'', W. W. Norton & Co, New York, ISBN 0393312763, p 342: "The astronomers and astrophysicists had come to Dallas to discuss quasars; they were not at all interested in Kerr's esoteric mathematical topic. So, as Kerr got up to speak, many slipped out of the lecture hall and into the foyer to argue with each other about their favorite theories of quasars. Others, less polite, remained seated in the hall and argued in whispers. Many of the rest catnapped in a fruitless effort to remedy their sleep deficits from late night science. Only a handful of relativists listened, with rapt attention. This was more than Achilles Papapetrou, one of the world's leading relativists, could stand. As Kerr finished, Papapetrou demanded the floor, stood up, and with deep feeling explained the importance of Kerr's feat. He, Papapetrou, had been trying for thirty years to find such a solution of Einstein's equation, and had failed, as had many other relativists. The astronomers and astrophysicists nodded politely, and then, as the next speaker began to hold forth on a theory of quasars, they refocussed their attention and the meeting picked up pace."〕 〔Further see, Roy P. Kerr (2007): "Discovering the Kerr and Kerr-Schild metrics" ( arXiv:0706.1109 )〕
== Early life and education==
Papapetrou was born near Serres, in the Salonica Vilayet of the Ottoman Empire (present-day Northern Greece, Macedonia province), on February 2, 1907. His father was a schoolteacher. During World War I, his family was deported from Serres, but returned at the end of the war.
From 1925, Papapetrou studied mechanical and electrical engineering at the National Technical University of Athens, graduating in 1930. While a student, he was an assistant in the mathematics department, and he started work as an engineer.
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