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| Howard Georgi-Glashow model | |
|---|---|
| Name | Howard Georgi–Glashow model |
| Fields | Theoretical physics |
| Institutions | Harvard University, Massachusetts Institute of Technology |
| Notable works | Grand Unified Theory |
Howard Georgi-Glashow model is a landmark proposal in particle physics that unifies gauge interactions by embedding the electroweak and strong forces into a larger gauge group. Originating from work by Howard Georgi and Sheldon Glashow in the 1970s, the model inspired intensive theoretical and experimental programs at institutions such as CERN, Fermilab, and SLAC National Accelerator Laboratory. Its structure motivated searches conducted by collaborations including ATLAS, CMS, and experiments at LEP and Super-Kamiokande.
The model proposes a unification based on the SU(5) gauge symmetry, combining generators that relate to representations familiar from Gell-Mann and Glashow's earlier classification. It situates the Standard Model gauge factors inside a single simple group analogous to unification attempts by Albert Einstein and pursuits at Institute for Advanced Study. The historical context links to discoveries at CERN ISR, theoretical advances by Steven Weinberg, Abdus Salam, and renormalization techniques developed by Kenneth Wilson.
The theoretical foundation rests on gauge symmetry principles formalized in texts by Murray Gell-Mann, Richard Feynman, and Julian Schwinger. The proposal draws on grand unification concepts similar to those explored by Howard Georgi and Sheldon Glashow and uses techniques from renormalization group analysis pioneered by Kenneth Wilson and applied in work by Politzer and Gross & Wilczek. Group-theoretic embedding employs Lie algebra machinery akin to methods used by Élie Cartan and Hermann Weyl, connecting to representation theory developed by I. Martin Isaacs and applied in particle classification by Eugene Wigner. Gauge coupling unification predictions trace back to running coupling calculations influenced by David Gross and Frank Wilczek.
Fermions are arranged into irreducible representations of SU(5), with one generation fitting into the {\bar 5} and 10 representations similar to tabulations by Murray Gell-Mann and Enrico Fermi's classification. The model incorporates quarks and leptons aligning with patterns observed at CERN SPS experiments and accelerator results from Fermilab Tevatron and DESY. Gauge bosons reside in the adjoint 24 representation, which includes Standard Model carriers analogous to those described by Sheldon Glashow, Steven Weinberg, and Abdus Salam. Exotic X and Y bosons mediate transitions that violate baryon number, a concept explored in contexts addressed by Sakharov and tested indirectly in neutrino observatories like Kamiokande and IMB.
Symmetry breaking is implemented via Higgs fields in the 24 and 5 representations, echoing scalar field usage in the Higgs mechanism developed by François Englert, Robert Brout, and Peter Higgs. The 24-plet acquires a vacuum expectation value that breaks SU(5) to the SM subgroup, paralleling spontaneous symmetry breaking studied by Yoichiro Nambu and Jeffrey Goldstone. The doublet–triplet splitting problem in the 5-plet connects to fine-tuning concerns discussed by Gerard 't Hooft and model-building strategies pursued at Harvard University and Princeton University. Scalar potential analyses leverage techniques from Edward Witten and Steven Weinberg.
Key predictions include gauge coupling unification at a high scale and proton decay mediated by X and Y bosons, topics central to tests at Super-Kamiokande, SNO, and Sudbury Neutrino Observatory. Proton lifetime estimates influenced experimental programs at Kamioka Observatory and theory work by Georgi & Glashow and later refinements by Dimopoulos and Georgi. The model anticipates mass relations among charged leptons and down-type quarks reminiscent of patterns noted by Harvey Ridgway and explored in grand unified model surveys at CERN. Neutrino mass implications influenced studies at IceCube, Double Chooz, and Daya Bay.
Nonobservation of predicted proton decay modes provided stringent constraints from experiments including Super-Kamiokande, IMB, Soudan Mine, and Frejus, prompting reassessment of minimal model parameters by researchers at Fermilab and CERN. Precision electroweak data from LEP, SLAC, and Tevatron constrained coupling unification fits used by analysts such as Langacker and Marciano. Cosmological implications tied to baryogenesis and monopole production linked investigations at Planck and WMAP, and collider searches for related particles were carried out by ATLAS, CMS, and earlier at UA1 and UA2.
Variations include supersymmetric extensions developed by researchers like Dimopoulos and Sakai and explored in the context of MSSM phenomenology at CERN LHC experiments. Flipped SU(5) constructions connect to work by Barr and Derendinger, while higher-rank unification schemes such as SO(10) and E6 were pursued by groups at Institute for Advanced Study and Brookhaven National Laboratory. String-theoretic embeddings via Heterotic string theory and compactification studies by Edward Witten and Cumrun Vafa linked grand unification to frameworks developed at Princeton University and Harvard University.
Category:Grand Unified Theories