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Some Phenomenology of Intersecting D-Brane Models

Gordon L. Kane, Piyush Kumar, Joseph D. Lykken, Ting T. Wang

TL;DR

This work develops a phenomenological framework for intersecting D-brane models in Type IIA, deriving explicit soft SUSY breaking terms under a $u$-moduli–dominated scenario and applying them to a local MSSM-like brane setup. It shows that, in this limit, the soft terms are independent of Yukawa couplings and Wilson lines, while yielding a distinctive pattern of non-degenerate gaugino masses and a common Higgs mass parameter, with the high-scale spectrum constrained by gauge coupling unification. By analyzing three representative points with light gluinos, the authors obtain winos, higgsinos, or bino–higgsino mixed LSPs and discuss their dark matter implications, including potential astrophysical signatures and non-thermal production possibilities. The results connect string-brane constructions to testable collider and cosmological phenomenology and point to future work on global embeddings and flux-induced SUSY breaking scenarios.

Abstract

We present some phenomenology of a new class of intersecting D-brane models. Soft SUSY breaking terms for these models are calculated in the u - moduli dominant SUSY breaking approach (in type IIA). In this case, the dependence of the soft terms on the Yukawas and Wilson lines drops out. These soft terms have a different pattern compared to the usual heterotic string models. Phenomenological implications for dark matter are discussed.

Some Phenomenology of Intersecting D-Brane Models

TL;DR

This work develops a phenomenological framework for intersecting D-brane models in Type IIA, deriving explicit soft SUSY breaking terms under a -moduli–dominated scenario and applying them to a local MSSM-like brane setup. It shows that, in this limit, the soft terms are independent of Yukawa couplings and Wilson lines, while yielding a distinctive pattern of non-degenerate gaugino masses and a common Higgs mass parameter, with the high-scale spectrum constrained by gauge coupling unification. By analyzing three representative points with light gluinos, the authors obtain winos, higgsinos, or bino–higgsino mixed LSPs and discuss their dark matter implications, including potential astrophysical signatures and non-thermal production possibilities. The results connect string-brane constructions to testable collider and cosmological phenomenology and point to future work on global embeddings and flux-induced SUSY breaking scenarios.

Abstract

We present some phenomenology of a new class of intersecting D-brane models. Soft SUSY breaking terms for these models are calculated in the u - moduli dominant SUSY breaking approach (in type IIA). In this case, the dependence of the soft terms on the Yukawas and Wilson lines drops out. These soft terms have a different pattern compared to the usual heterotic string models. Phenomenological implications for dark matter are discussed.

Paper Structure

This paper contains 14 sections, 33 equations, 1 figure, 5 tables.

Table of Contents

  1. Introduction
  2. General construction of intersecting brane models.
  3. A local MSSM-like model
  4. Getting the MSSM
  5. Global embedding and supersymmetry breaking
  6. Exotic matter and $\mu$ problem
  7. Type IIA - type IIB equivalence
  8. $\mathcal{N}=1$ SUSY
  9. Low energy effective action and soft terms
  10. Soft terms in general soft broken $\mathcal{N}=1$, $D=4$ supergravity Lagrangian
  11. Soft terms in intersecting brane models
  12. Some phenomenological implications
  13. Conclusion
  14. Appendix

Figures (1)

  • Figure 1: Cosmic ray positron excess due to LSP annihilations. Crossed points are HEAT experimental data. The dotted line is from the standard cosmological model without taking into account the LSP annihilation contributions. The solid line is for the $\widetilde{W}$ LSP model, the dashed line is for the $\widetilde{H}$ LSP model and the dashed -dotted line is for the mixed $\widetilde{B}$-$\widetilde{H}$ LSP model. Bs is the boost factor.