Reconciling grand unification with strings by anisotropic compactifications

Journal Article · Mon Sep 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.066006· OSTI ID:21254208

Dundee, Ben; Raby, Stuart; Wingerter, Akin ^[1]

---

1. Department of Physics, Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210 (United States)

We analyze gauge coupling unification in the context of heterotic strings on anisotropic orbifolds. This construction is very much analogous to effective five-dimensional orbifold grand unified theory field theories. Our analysis assumes three fundamental scales: the string scale M{sub S}, a compactification scale M{sub C}, and a mass scale for some of the vectorlike exotics M{sub EX}; the other exotics are assumed to get mass at M{sub S}. In the particular models analyzed, we show that gauge coupling unification is not possible with M{sub EX}=M{sub C}, and in fact we require M{sub EX}<<M{sub C}{approx}3x10{sup 16} GeV. We find that about 10% of the parameter space has a proton lifetime (from dimension six gauge exchange) 10{sup 33} yr < or approx. {tau}(p{yields}{pi}{sup 0}e{sup +})< or approx. 10{sup 36} yr. The other 80% of the parameter space gives proton lifetimes below Super-Kamiokande bounds. The next generation of proton decay experiments should be sensitive to the remaining parameter space.

• OSTI ID: 21254208
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
COMPACTIFICATION
CONSTRUCTION
COUPLING
EEV RANGE
FIELD THEORIES
GRAND UNIFIED THEORY
LIFETIME
MASS
PARTICLE DECAY
PROTONS
SPACE
STRING MODELS