Howard Georgi

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Howard Georgi
Howard Mason Georgi III

(1947-01-06) 6 January 1947 (age 76)
Alma mater
Known for
Scientific career
Doctoral advisorCharles M. Sommerfield
Doctoral students

Howard Mason Georgi III (born January 6, 1947) is an American theoretical physicist and the Mallinckrodt Professor of Physics and Harvard College Professor at Harvard University.[1] He is also director of undergraduate studies in physics. He was co-master and then faculty dean of Leverett House with his wife, Ann Blake Georgi, from 1998 to 2018. His early work was in Grand Unification and gauge coupling unification within SU(5) and SO(10) groups (see Georgi–Glashow model).


Georgi graduated from Pingry School in 1964,[2] graduated from Harvard College in 1967 and obtained his Ph.D. from Yale University in 1971.[1] He was junior fellow in the Harvard Society of Fellows from 1973–76 and a senior fellow from 1982-1998.[1]


In early 1974 Georgi (with Sheldon Glashow) published the first grand unified theory (GUT), the Minimal SU(5) Georgi–Glashow model.[3] Georgi independently (alongside Harald Fritzsch and Peter Minkowski) published a minimal SO(10) GUT model in 1974.[4]

Georgi proposed an SU(5) GUT model with softly broken supersymmetry with Savas Dimopoulos in 1981. This paper is one of the foundational works for the supersymmetric Standard Model (MSSM). After the measurements of the three Standard Model gauge couplings at LEP I in 1991, it was shown that particle content of the MSSM, in contrast to the Standard Model alone, led to precision gauge coupling unification.

He has since worked on several different areas of physics including composite Higgs models, heavy quark effective theory, dimensional deconstruction, little Higgs,[5] and unparticle theories.

Unparticle physics is a theory that there exists matter that cannot be explained in terms of particles, because its components are scale invariant. Howard Georgi proposed this theory in the spring of 2007 in the papers "Unparticle Physics" and "Another Odd Thing About Unparticle Physics".[6][7]

Together with Vadim Kuzmin, Georgi received the Pomeranchuk Prize of the Alikhanov Institute for Theoretical and Experimental Physics (ITEP) in 2006.[5]

Georgi has published several books, one of which is Lie Algebras in Particle Physics published by World Scientific. He has also published The Physics of Waves and Weak Interactions and Modern Particle Theory.


In 1995 he was elected to the National Academy of Sciences[1] and received the Sakurai Prize; in 2000 he shared the Dirac Medal with Jogesh Pati and Helen Quinn.[8]


  1. ^ a b c d e "Howard Georgi". American Institute of Physics, Center for History of Physics. Archived from the original on March 6, 2016. Retrieved June 11, 2013.
  2. ^ Class Notes, The Pingry Review, Summer 2012. Accessed March 14, 2022. "1964... Howard Georgi writes, 'Still teaching physics at Harvard'"
  3. ^ Georgi, Howard & Glashow, Sheldon (1974). "Unity of All Elementary-Particle Forces". Physical Review Letters. 32 (8): 438
  4. ^ Howard Georgi, "The state of the art—gauge theories" Particles and Fields 1974, ed. Carl E. Carlson
  5. ^ a b "Pomeranchuk Prize Winners 2006". Alikhanov Institute for Theoretical and Experimental Physics (ITEP). Archived from the original on February 24, 2016. Retrieved June 11, 2013.
  6. ^ Howard Georgi, "Unparticle Physics", 23 March 2007 (accessed 29 January 2007).
  7. ^ Howard Georgi, "Another Odd Thing About Unparticle Physics", 19 April 2008 (accessed 29 January 2008).
  8. ^ "Dirac Medallists 2000". Abdus Salam International Centre for Theoretical Physics. Retrieved June 11, 2013.

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