Aspects of Type I String Phenomenology

Details Aspects of Type I String Phenomenology Aspects of Type I String Phenomenology

1998-12-16

arxiv.org/abs/hep-ph/9812397v2

Nucl.Phys. B553 (1999) 43-80

Physics

High Energy Physics

High Energy Physics - Phenomenology

47 pages, Latex2e, 4 EPS figures, using epsfig. Minor typos and references added

Scientific paper

10.1016/S0550-3213(99)00264-3

We study different phenomenological aspects of compact, D=4, N=1 Type IIB orientifolds considered as models for unification of the standard model and gravity. We discuss the structure of the compactification, string and unification scales depending on the different possible D-brane configurations. It is emphasized that in the context of Type I models the $M_W/M_{Planck}$ hierarchy problem is substantially alleviated and may be generated by geometrical factors. We obtain the effective low-energy supergravity Lagrangian and derive the form of soft SUSY-breaking terms under the assumption of dilaton/moduli dominance. We also discuss the role of anomalous U(1)'s and of twisted moduli in this class of theories. A novel mechanism based on the role of singularities is suggested to achieve consistency with gauge coupling unification in low string scale models.

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