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APS » Journals » Phys. Rev. Lett. » Volume 76 » Issue 10
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Phys. Rev. Lett. 76, 1566–1569 (1996)

New Scenario for String Unification

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Jorge L. Lopez1 and D. V. Nanopoulos2,3
1Department of Physics, Bonner Nuclear Lab, Rice University, 6100 Main Street, Houston, Texas 77005
2Center for Theoretical Physics, Department of Physics, Texas A&M University, College Station, Texas 77843-4242
3Astroparticle Physics Group, Houston Advanced Research Center (HARC), The Mitchell Campus, The Woodlands, Texas 77381

Received 27 November 1995; published in the issue dated 4 March 1996

We present a new scenario for gauge coupling unification in flipped SU(5) string models, which identifies the M32 scale of SU(3) and SU(2) unification with the empirical MLEP∼1015-16GeV scale, and the M51 scale of SU(5) and U(1) unification with the theoretical Mstring∼5×1017GeV string unification scale. The vacuum shift necessary for the cancellation of the anomalous UA(1) and an SU(4) hidden sector with fractionally charged particles play a crucial role in the dynamical determination of all intermediate mass scales in this scenario.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1566
DOI:
10.1103/PhysRevLett.76.1566
PACS:
12.10.Dm, 11.25.Mj, 12.10.Kt, 12.60.Jv
 
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