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Volume 15

The Berlin Years: Writings & Correspondence, June 1925 - May 1927

Volume 15

Editors: Diana Kormos Buchwald, József Illy, A. J. Kox, Dennis Lehmkuhl, Ze'ev Rosenkranz, Jennifer Nollar James
Associate & Contributing Editors: Anthony Duncan, Marco Giovanelli, Michel Janssen, Daniel J. Kennefick, Issachar Unna
Assistant Editors: Emily de Araújo, Rudy Hirschmann, Nurit Lifshitz, Barbara Wolff

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This volume covers one of the most thrilling two-year periods in twentieth-century physics, as matrix mechanics—developed chiefly by W. Heisenberg, M. Born, and P. Jordan—and wave mechanics—developed by E. Schrödinger—supplanted the earlier quantum theory. The almost one hundred writings by Einstein—of which a third have never been published—and the more than thirteen hundred letters show Einstein's immense productivity and hectic pace of life.

Einstein quickly grasps the conceptual peculiarities involved in the new quantum mechanics, such as the difference between Schrödinger's wave function and a field defined in spacetime, or the emerging statistical interpretation of both matrix and wave mechanics. Inspired by correspondence with G. Y. Rainich, he investigates with Jakob Grommer the problem of motion in general relativity, hoping for a hint at a new avenue to unified field theory.

Einstein falls victim to scientific fraud, when, in a collaboration with E. Rupp, he becomes convinced that the latter's experiments aimed at deciding whether excited atoms emit light instantaneously (in quanta), or in a finite time (in waves), confirm a wave-theoretic explanation.

While it was known that the teenage Einstein had been romantically involved with Marie Winteler in 1895, newly discovered documents reveal that his love for Marie was rekindled in 1909–10, while he was still married to Mileva Marić.

The 1925 Locarno Treaties renew Einstein's optimism in European reconciliation. He backs the "International manifesto against compulsory military service" and continues his participation in the League of Nations' International Committee on Intellectual Cooperation. He remains intensely committed to the shaping of the Hebrew University in Jerusalem, although his enthusiasm for this cause is sorely tested.