Léon Rosenfeld

Léon Rosenfeld (French: [ʁɔzɛnfɛld]; 14 August 1904 in Charleroi – 23 March 1974^[1]) was a Belgian physicist and a communist activist.

Léon Rosenfeld
Rosenfeld in 1963
Born	14 August 1904 Charleroi, Belgium
Died	March 23, 1974(1974-03-23) (aged 69)
Citizenship	Belgium
Alma mater	University of Liège (PhD, 1926)
Known for	Belinfante–Rosenfeld stress–energy tensor, coined the term lepton
Spouse	Yvonne Cambresier
Children	Andrée, Jean
Awards	Francqui Prize (1949)
Signature

Rosenfeld was born into a secular Jewish family. He was a polyglot who knew eight or nine languages and was fluent in at least five of them.^[2]

Rosenfeld obtained a PhD at the University of Liège in 1926, and he was a close collaborator of the physicist Niels Bohr from 1930 until Bohr's death in 1962.^[3] Rosenfeld published in 1930 the first systematic Hamiltonian approach to Lagrangian models that possess a local gauge symmetry, which predates by two decades the work by Paul Dirac and Peter Bergmann.^[4] Rosenfeld contributed to a wide range of physics fields, from statistical physics and quantum field theory to astrophysics.^[2] Along with Frederik Belinfante, he derived the Belinfante–Rosenfeld stress–energy tensor. He also founded the journal Nuclear Physics and coined the term lepton.^[5]

In 1933, Rosenfeld married Yvonne Cambresier, who was one of the first women to obtain a Physics PhD from a European university. They had a daughter, Andrée Rosenfeld (1934–2008) and a son, Jean Rosenfeld.^[6]

Awards and honors

Rosenfeld held chairs at multiple universities: Liège, Utrecht, Manchester, and Copenhagen.^[2]

He was elected to membership of the Manchester Literary and Philosophical Society in 1948.^[7]

In 1949 Léon Rosenfeld was awarded the Francqui Prize for Exact Sciences.^[2]

Works

• Rosenfeld, Léon (1948). Nuclear Forces. North-Holland.
• Rosenfeld, Léon (1951). Theory Of Electrons. North-Holland.
• Bohr, Niels; Rosenfeld, Léon (1933). "Zur Frage der Messbarkeit der elektromagnetischen Feldgrössen" [On the Question of the Measurability of Electromagnetic Field Quantities]. Royal_Danish_Academy_of_Sciences_and_Letters (in German): 123–166 – via Translated from German (1996) Niels Bohr Collected Works. Vol. 7. North–Holland: Amsterdam. Demonstrated the logical consistency of quantum electrodynamics.
• Rosenfeld, L. (1971). "Men and Ideas in the History of Atomic Theory". Archive for History of Exact Sciences. 7 (2): 69–90. ISSN 0003-9519.