Unification Scale in String Theory

Abstract

We study the unification scale and gauge coupling constant in 4D string theory. We show that the fine structure constant is determined by the dimension of the hidden gauge group and only $SU(6)$ and $SO(9)$ are consistent with minimal string unification while the unification scale can be of order of $10^{16}GeV$.

12 pages (LaTeX)

References in corpus (6)

• Duality Anomaly Cancellation, Minimal String Unification and the Effective Low-Energy Lagrangian of 4-D Strings
• Moduli Corrections to Gauge and Gravitational Couplings in four dimensional Superstrings
• Moduli Corrections to Gravitational Couplings from String loops
• Gauge Coupling Running in Minimal SU(3)xSU(2)xU(1) Superstring Unification
• Gaugino condensation in 4-D superstring models
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Cited by in corpus (4)

• String Unification, Spaghetti Diagrams and Infra-Red Fixed Points
• String Gauge Unification and Infra-red Fixed Points in MSSM+X Models
• Unification of couplings and soft supersymmetry breaking terms in 4D superstring models
• Phenomenological implications from moduli fields in strings