Pascual Jordan

Pascual Jordan. He was a pivotal German theoretical physicist who made foundational contributions to the development of quantum mechanics and quantum field theory. Working closely with Max Born and Werner Heisenberg in the mid-1920s, he was instrumental in formulating the matrix-based version of quantum theory. His later work extended into cosmology and biology, though his legacy is complicated by his involvement with the Nazi Party.

Early life and education

Born in Hanover, Jordan displayed an early aptitude for mathematics and science. He began his university studies at the Technical University of Hanover before transferring to the University of Göttingen, a leading center for physics and mathematics. At Göttingen, he studied under prominent figures like David Hilbert and Richard Courant, eventually becoming a doctoral student and assistant to Max Born. His early research focused on problems in the nascent field of quantum theory, setting the stage for his groundbreaking collaborative work.

Scientific contributions

Jordan's most celebrated work was his collaboration with Max Born and Werner Heisenberg in 1925, which led to the formulation of matrix mechanics, the first complete theoretical framework for quantum mechanics. He played a crucial role in developing the mathematical formalism, including the fundamental canonical commutation relation. Independently, he co-developed the Jordan-Wigner transformation with Eugene Wigner. He was a pioneer of quantum field theory, introducing the concept of second quantization and contributing to the development of quantum electrodynamics. His name is also attached to non-associative algebraic structures known as Jordan algebras. Later, he applied physical principles to speculative theories in cosmology and theoretical biology.

Political and philosophical views

During the rise of the Third Reich, Jordan joined the Nazi Party in 1933 and became a member of the Sturmabteilung. He sought to align modern physics, particularly his work on quantum field theory, with Nazi ideology, engaging in polemics against so-called "Jewish physics" associated with Albert Einstein. His political activism and publications supporting the regime, including for the Luftwaffe, facilitated his academic advancement but isolated him from many peers in the international scientific community like Niels Bohr and Wolfgang Pauli. His philosophical writings often explored the implications of quantum theory for epistemology and vitalism.

Later life and legacy

After World War II, Jordan's past led to a temporary suspension from academic duties during the denazification process. He eventually resumed his career, holding a professorship at the University of Hamburg and serving as a member of the German Bundestag for the Christian Democratic Union from 1957 to 1961. He received the Max Planck Medal in 1942 and was later elected to the Academy of Sciences and Humanities in Göttingen. Despite his significant scientific achievements, his legacy remains indelibly marred by his enthusiastic support for the Nazi dictatorship, a subject of continued historical and ethical examination by scholars of the period.

Selected publications

* *Zur Quantenmechanik* (with M. Born and W. Heisenberg), Zeitschrift für Physik (1925) * *Über quantenmechanische Darstellung von Quantensprüngen* (with O. Klein and E. Wigner), Zeitschrift für Physik (1928) * *Anschauliche Quantentheorie* (1936) * *Die Physik des 20. Jahrhunderts* (1936) * *Schwerkraft und Weltall* (1952)

Category:German theoretical physicists Category:Quantum mechanics Category:Max Planck Medal recipients Category:1902 births Category:1980 deaths