Abstract
The MiniBooNE collaboration found evidence for the existence of sterile neutrinos, at a mass scale comparable to the active left–handed neutrinos. While sterile neutrinos arise naturally in large volume string scenarios, they are more difficult to accommodate in heterotic–string derived models that reproduce the GUT embedding of the Standard Model particles. Sterile neutrinos in heterotic–string models imply the existence of an additional Abelian gauge symmetry at low scales, possibly within reach of contemporary colliders. I discuss the construction of string derived Z′ models that utilise the spinor–vector duality to guarantee that the extra U(1) Z′ symmetry can remain unbroken down to low scales.
Highlights
Physics is first and foremost an experimental science
All the observed data to date is consistent with the hypothesis that the Standard Model remains a viable perturbative parametrisation up to very high energy scales, e.g. the Grand Unified Theory (GUT), where all the gauge interactions are of comparable strength, or the Planck scale, where the magnitude of the gauge and gravitational couplings is comparable
The conclusion is that existence of sterile neutrinos at low scales requires that they are chiral with respect to an additional U (1) gauge symmetry beyond the Standard Model
Summary
Physics is first and foremost an experimental science. Be that as it may, the language that is used to parametrise experimental data is mathematics. All the observed data to date is consistent with the hypothesis that the Standard Model remains a viable perturbative parametrisation up to very high energy scales, e.g. the Grand Unified Theory (GUT), where all the gauge interactions are of comparable strength, or the Planck scale, where the magnitude of the gauge and gravitational couplings is comparable Further evidence for this hypothesis stems from the logarithmic running of the Standard Model parameters, and the suppression of left–handed neutrino masses and proton decay mediating operators. In large volume scenarios the bulk fields behave like sterile neutrinos with suppressed couplings to the left–handed neutrino brane fields with potentially observational effects [5] In this scenarios, the appealing embedding of the Standard Model states in SO(10) representations is abandoned
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