GEORGI, HOWARD M. / Physics / Researchers

International Center for Scientific Research




Mallinckrodt Professor of Physics, Lyman Laboratory of Physics, Harvard University, Cambridge, California, U.S.A.

Research interests

Howard Georgi has ongoing research programs in several areas of theoretical particle physics. The common elements in these areas are symmetries and quantum field theory. Georgi pioneered the subject of Grand Unified Theories, both without (with Sheldon Glashow) and with supersymmetry (with Savas Dimopoulos), invented the modern QCD quark model (with Glashow and Alvaro De Rujula), the chiral quark model (with former student Aneesh Manohar), and the Heavy Quark Effective Theory.

In addition, he is interested in increasing the participation of women and minorities in science and is on a number of local and national committees that attempt to address this important issue.

Major Research Accomplishments in Particle Theory :

· Constructed the SU(5) and SO(10) grand unified theories, with Glashow. Unity of all Elementary Particle Forces, (with S. L. Glashow), Phys. Rev. Lett. 32 438 (1974).

· Developed the theory of coupling constant renormalization in GUTs, with Quinn and Weinberg.
Hierarchy of Interactions in Unified Gauge Theories, (with H. Quinn and S. Weinberg), Phys. Rev. Lett. 33 451 (1974).

· Did the first calculations of QCD radiative corrections, with Appelquist. e+e¡ Annihilation in Gauge Theories of Strong Interactions, (with T. Appelquist), Phys. Rev. D8 4000 (1973).

· Developed the modern QCD-motivated quark model, understood the §-¤ mass difference as the result of the quark mass dependence of color-magnetism, and correctly predicted the masses of the low-lying charmed particles, with De Rujula and Glashow. Hadron Masses in a Gauge Theory, (with A. De Rujula and S. Glashow), Phys. Rev. D12 147 (1975).

· Developed the theory and did one the first phenomenological analyses of scaling violation in deep inelastic lepton-hadron scattering, with Politzer, and De Rujula and Politzer. Electroproduction Scaling in an Asymptotically Free Theory of Strong Interactions, (with H. David Politzer), Phys. Rev. D9 416 (1974); Demythification of Electroproduction Local Duality and Precocious Scaling, Annals of Physics 103 315 (1977).

· Developed the idea of Gluon fusion for Higgs production, with Glashow, Machacek, and Nanopoulos. Higgs Bosons from Two Gluon Annihilation in Proton-Proton Collisions, (with S. L. Glashow, M. Machacek, and D. V. Nanopoulos), Phys. Rev. Lett. 40 692 (1978).

· Helped develop the modern theory of perturbative QCD, with Politzer and others. Clean Tests of QCD in¹ ¡ P Scattering, (with H. D. Politzer), Phys. Rev. Lett. 40 3 (1978); Perturbation Theory and the Parton Model in QCD, (with R. K. Ellis, M. Machacek, H. D. Politzer, and G. G. Ross), Nucl. Phys. B152 285 (1979).

· Helped develop the modern view of effective field theories. Effective Field Theory, in Annual Review of Nuclear and Particle Science, ed. J. D. Jackson, vol. 43, 209 (1994)

· Constructed an SU(5) GUT with softly broken supersymmetry, with Dimopoulos. This work laid the foundation for the supersymmetric standard model and predicted sin2 µ in agreement with present day precise tests. Softly Broken Supersymmetry and SU(5), (with S. Dimopoulos), Nucl. Phys. B193, 150 (1981).

· Developed the chiral quark model, with Manohar. Chiral Quarks and the Nonrelativistic Quark Model, (with A. Manohar), Nucl. Phys. B234, 189 (1984).

· Developed the theory of composite Higgs bosons, with Kaplan and Dimopoulos. SU(2)£U(1) Breaking by Vacuum Misalignment, (with D. Kaplan), Phys. Lett. 136B, 183 (1984); Composite Higgs Scalars, (with D. Kaplan and S. Dimopoulos), Phys. Lett. 136B, 187 (1984).

· Constructed simple composite models with massless fermions. A Tool Kit For Builders of Composite Models, Nuclear Physics B266, 274 (1986).

· Constructed technicolor models without flavor-changing neutral current problems, with Chivukula and Randall. A Composite Technicolor Standard Model of Quarks, (with R.S. Chivukula and L. Randall) Nucl. Phys. B292, 93 (1987).

· Developed the heavy quark effective field theory. An Effective Field Theory for Heavy Quarks at Low Energies, Phys. Lett. B240, 447 (1990).

· Found a class of 4-dimensional filed theories in which extra dimensions can arise dynamically, providing a new slant on the meaning of space. (De)constructing dimensions, (with N. Arkani-Hamed and A. G. Cohen) Phys. Rev. Lett. 86, 4757 (2001).

· Constructed the first "little higgs" model, in which the Higgs bosons is a pseudo-Goldstone boson without fine tuning. Electroweak symmetry breaking from dimensional deconstruction, (with N. Arkani-Hamed and A. G. Cohen) Phys. Lett. B 513, 232 (2001).

Prizes and awards

· 1995 Sakurai Prize, American Physical Society, "For his pioneering contributions to the unification of strong and electroweak interactions, and for his application of quantum chromodynamics to the properties and interactions of hadrons".
· 1999 Levenson Memorial Teaching Award.
· 2000 Dirac Medal from the Abdus Salam International Centre for Theoretical Physics, "for pioneering contributions to the quest for a unified theory of quarks and leptons and of the strong, weak, and electromagnetic interactions".
· 2002 Phi Beta Kappa Teaching award from ®-of Massachusetts


H. Georgi and S.L. Glashow, "Unity of all elementary particle forces." Phys. Rev. Lett. 32: 438 (1974).

H. Georgi, H. Quinn, and S. Weinberg, "Hierarchy of interactions in unified gauge theories." Phys. Rev. Lett. 33: 451 (1974).

H. Georgi, A. De Rujula, and S. Glashow, "Hadron masses in a gauge theory." Phys. Rev. D. 12: 147 (1975).

H. Georgi and S. Dimopoulos, "Softly broken supersymmetry and SU(5)." Nucl. Phys. B. 193:150 (1981).

H. Georgi and A. Manohar, "Chiral quarks and the nonrelativistic quark model." Nucl. Phys. B. 234: 189 (1984).

H. Georgi, "An effective field theory for heavy quarks at low energies." Phys. Lett. B. 240: 447 (1990).

H. Georgi, N. Arkani-Hamed, and A. Cohen, "(De)Constructing Dimensions." Phys. Rev. Lett. 86: 4757 (2001).

H. Georgi, N. Arkani-Hamed, and A. Cohen, "Twisted Supersymmetry and the Topology of Theory Space." hep-th0109082.

Books :

1981 Lie Algebras in Particle Physics
(Benjamin/Cummings, Reading, MA).

1999 Revised Edition

1984 Weak Interactions and Modern Particle Theory
(Benjamin/Cummings, Menlo Park, CA).

1992 The Physics of Waves
(Prentice-Hall, Inc., Englewood Cliffs, NJ).

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