Anomaly Mediation and Cosmology

Abstract

We consider an extension of the MSSM wherein anomaly mediation is the source of supersymmetry breaking, and the tachyonic slepton problem is solved by a gauged U(1) symmetry, which is broken at high energies in a manner preserving supersymmetry, thereby also facilitating the see-saw mechanism for neutrino masses and a natural source for the Higgs mu-term. We show that these favourable outcomes can occur both in the presence and the absence of a large Fayet-Iliopoulos (FI) D-term associated with the new U(1). We explore the cosmological consequences of the model, showing that it naturally produces a period of hybrid inflation, terminating in the production of cosmic strings. In spite of the presence of a U(1) (even with an FI term), inflation is effected by the F-term, with a D-flat tree potential (the FI term, if present, being cancelled by non-zero squark and slepton fields). Calculating the 1-loop corrections to the inflaton potential, we estimate the constraints on the parameters of the model from Cosmic Microwave Background data. We will see that a consequence of these constraints is that the Higgs mu-term necessarily small. We briefly discuss the mechanisms for baryogenesis via conventional leptogenesis, the out-of-equilibrium production of neutrinos from the cosmic strings, or the Affleck-Dine mechanism. Cosmic string decays also boost the relic density of dark matter above the low value normally obtained in AMSB scenarios.

34 pages. Revised to incorporate discussion of the case when the Fayet-Ilipoulos term is absent

References in corpus (13)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Power Spectra and WMAP-Derived Parameters
• The Next-to-Minimal Supersymmetric Standard Model
• Gravitational wave stochastic background from cosmic (super)strings
• Comments on Supercurrent Multiplets, Supersymmetric Field Theories and Supergravity
• Fitting CMB data with cosmic strings and inflation
• Constraints on Supersymmetric Models of Hybrid Inflation
• Comments on the Fayet-Iliopoulos Term in Field Theory and Supergravity
• Anatomy of F_D-Term Hybrid Inflation
• Neutralino, axion and axino cold dark matter in minimal, hypercharged and gaugino AMSB
• Supersymmetric Leptogenesis and the Gravitino Bound
• Enlarging the parameter space of standard hybrid inflation
• Anomaly Mediation and Dimensional Transmutation

Cited by in corpus (5)

• Cosmic string parameter constraints and model analysis using small scale Cosmic Microwave Background data
• Update on Minimal Supersymmetric Hybrid Inflation in Light of PLANCK
• Anomaly mediated SUSY breaking scenarios in the light of cosmology and in the dark (matter)
• Strictly Anomaly Mediated Supersymmetry Breaking
• Consistent cosmology with Higgs thermal inflation in a minimal extension of the MSSM