Reconciling Grand Unification with Strings by Anisotropic Compactifications

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dc.creatorDundee, Ben
dc.creatorRaby, Stuart
dc.creatorWingerter, Akin
dc.date2008-05-27
dc.date2008-07-31
dc.date.accessioned2026-07-07T12:43:51Z
dc.date.available2026-07-07T12:43:51Z
dc.descriptionWe analyze gauge coupling unification in the context of heterotic strings on anisotropic orbifolds. This construction is very much analogous to effective 5 dimensional orbifold GUT field theories. Our analysis assumes three fundamental scales, the string scale, $\mstring$, a compactification scale, $\mc$, and a mass scale for some of the vector-like exotics, $\mex$; the other exotics are assumed to get mass at $\mstring$. In the particular models analyzed, we show that gauge coupling unification is not possible with $\mex = \mc$ and in fact we require $\mex \ll \mc \sim 3 \times 10^{16}$ GeV. We find that about 10% of the parameter space has a proton lifetime (from dimension 6 gauge exchange) $10^{33} {\rm yr} \lesssimτ(p\to π^0e^+) \lesssim 10^{36} {\rm yr}$. The other 80% of the parameter space gives proton lifetimes below Super-K bounds. The next generation of proton decay experiments should be sensitive to the remaining parameter space.
dc.description36 pages and 5 figures, contains some new references and additional paragraph in conclusion
dc.identifierhttps://arxiv.org/abs/0805.4186
dc.identifierhttp://arxiv.org/abs/0805.4186
dc.identifierPhys.Rev.D78:066006,2008
dc.identifierdoi:10.1103/PhysRevD.78.066006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220567
dc.subjectHigh Energy Physics - Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.titleReconciling Grand Unification with Strings by Anisotropic Compactifications
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