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	\| name = Julian Schwinger		\| name = Julian Schwinger
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{{Infobox scientist
| name = Julian Schwinger
| image = Julian_Schwinger.jpg
| caption = Julian Schwinger
| birth_date = 12 February 1918
| birth_place = New York City, U.S.
| death_date = 16 July 1994
| death_place = Los Angeles, California, U.S.
| fields = Theoretical physics
| workplaces = Harvard University; University of California, Los Angeles
| alma_mater = Columbia University
| doctoral_advisor = Isidor Isaac Rabi
| known_for = Quantum electrodynamics; Schwinger effect; source theory; variational methods
| awards = Nobel Prize in Physics (1965)
}}

'''Julian Schwinger''' (12 February 1918 - 16 July 1994) was an American theoretical physicist whose work helped establish modern [[Physics:Quantum Electrodynamics (QED)|quantum electrodynamics]]. He shared the 1965 Nobel Prize in Physics with [[Biography:Richard Feynman|Richard Feynman]] and Sin-Itiro Tomonaga for fundamental work in QED, including methods for calculating the interaction of light and charged particles with high precision.<ref>{{cite web |url=https://www.nobelprize.org/prizes/physics/1965/schwinger/biographical/ |title=Julian Schwinger - Biographical |publisher=Nobel Prize Outreach |access-date=20 May 2026}}</ref>

Schwinger was known for a highly formal and operator-based style of physics. During and after World War II he developed techniques that became part of the standard language of [[Physics:Quantum electromagnetic field|quantized electromagnetic fields]]. His calculation of the electron's anomalous magnetic moment was a landmark result, showing how quantum field theory could produce precise measurable predictions.

== Quantum field theory ==
Schwinger's work sits at the center of the transition from early quantum mechanics to renormalized [[Physics:Quantum field theory (QFT) core|quantum field theory]]. He developed operator methods, Green-function techniques, and variational principles that influenced particle physics, many-body theory, and later field-theoretic approaches.

The Schwinger effect, the predicted creation of particle-antiparticle pairs by an extremely strong electric field, remains an important theoretical idea in high-field physics and quantum vacuum studies. It connects QED with [[Physics:Quantum vacuum field|vacuum field]] behavior and the limits of classical electromagnetic description.

== See also ==
* [[Physics:Quantum Electrodynamics (QED)]]
* [[Physics:Quantum electromagnetic field]]
* [[Physics:Quantum field theory (QFT) basics]]
* [[Biography:Richard Feynman]]

== References ==
{{reflist|3}}

{{DEFAULTSORT:Schwinger, Julian}}
[[Category:Nobel laureates in Physics]]
[[Category:Quantum physicists]]
[[Category:Theoretical physicists]]

{{Sourceattribution|Biography:Julian Schwinger|1}}

Biography:Julian Schwinger - Revision history

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