String Phenomenology 2017 (Conference)

We review the possibility that the Supersymmetric Standard Model arises from orbifold constructions of the E8×E8 Heterotic Superstring, and the phenomenological properties that such a model should have. In particular, trying to solve the discrepancy between the unification scale predicted by the Heterotic Superstring (≈g GUT × 5.27 × 1017 GeV ) and the value deduced from LEP experiments (≈2 × 1016 GeV ), we will predict the presence at low energies of three families of Higgses and vector-like colour triplets. Our approach relies on the Fayet–Iliopoulos breaking, and this is also a crucial ingredient, together with having three Higgs families, to obtain in these models an interesting pattern of fermion masses and mixing angles at the renormalizable level. Namely, after the gauge breaking some physical particles appear combined with other states, and the Yukawa couplings are modified in a well-controlled way. On the other hand, dangerous flavour-changing neutral currents may appear when fermions of a given charge receive their mass through couplings with several Higgs doublets. We will address this potential problem, finding that viable scenarios can be obtained for a reasonable light Higgs spectrum.

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String phenomenology from a worldsheet perspective

The European Physical Journal C ◽

10.1140/epjc/s10052-019-7222-5 ◽

2019 ◽

Vol 79 (8) ◽

Cited By ~ 2

Author(s):

Alon E. Faraggi

Keyword(s):

String Phenomenology

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PROGRESS IN WEAKLY COUPLED STRING PHENOMENOLOGY

International Journal of Modern Physics A ◽

10.1142/s0217751x02013022 ◽

2002 ◽

Vol 17 (supp01) ◽

pp. 70-83

Author(s):

MARY K. GAILLARD

Keyword(s):

String Theory ◽

Supersymmetry Breaking ◽

Particle Physics ◽

Specific Model ◽

Heterotic String ◽

Particle Spectrum ◽

Heterotic String Theory ◽

Hidden Sector ◽

String Phenomenology ◽

Weakly Coupled

The weakly coupled vacuum of E8 ⊗ E8 heterotic string theory remains an attractive scenario for particle physics. The particle spectrum and the issue of dilaton stabilization are reviewed. A specific model for hidden sector condensation and supersymmetry breaking, that respects known constraints from string theory, is described, and its phenomenological and cosmological implications are discussed.

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Mathematics for string phenomenology

International Journal of Modern Physics A ◽

10.1142/s0217751x15300185 ◽

2015 ◽

Vol 30 (03) ◽

pp. 1530018

Author(s):

Michael R. Douglas

Keyword(s):

Mirror Symmetry ◽

Complex Structure ◽

Toric Geometry ◽

Mathematical Ideas ◽

String Phenomenology ◽

Calabi Yau Manifolds

We survey some of the basic mathematical ideas and techniques which are used in string phenomenology, such as constructions of Calabi–Yau manifolds, singularities and orbifolds, toric geometry, variation of complex structure, and mirror symmetry.

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