Small steps towards Grand Unification and the electron/positron excesses in cosmic-ray experiments

Abstract

We consider a small extension of the standard model by adding two Majorana fermions; those are adjoint representations of the SU(2)_L and SU(3)_c gauge groups of the standard model. In this extension, the gauge coupling unification at an energy scale higher than 10^{15} GeV is realized when the masses of the triplet and the octet fermions are smaller than 10^4 GeV and 10^{12} GeV, respectively. We also show that an appropriate symmetry ensures a long lifetime of the neutral component of the triplet fermion whose thermal relic density naturally explains the observed dark matter density. The electron/positron excesses observed in recent cosmic-ray experiments can be also explained by the decay of the triplet fermion.

11 pages, 5 figures

References in corpus (37)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Observation of an anomalous positron abundance in the cosmic radiation
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Precision Corrections in the Minimal Supersymmetric Standard Model
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• The energy spectrum of cosmic-ray electrons at TeV energies
• Astrophysical Axion Bounds
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Non-perturbative Effect on Thermal Relic Abundance of Dark Matter
• Measurements of the Cosmic-Ray Positron Fraction From 1 to 50 GeV
• Positron Propagation and Fluxes from Neutralino Annihilation in the Halo
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• Decaying Dark Matter can explain the electron/positron excesses
• Discovering Supersymmetry at the Tevatron in Wino LSP Scenarios
• Dark Matter Interpretations of the Electron/Positron Excesses after FERMI
• Possible Signals of Wino LSP at the Large Hadron Collider
• Decaying Dark Matter and the PAMELA Anomaly
• Heavy Wino-like Neutralino Dark Matter Annihilation into Antiparticles
• Search for Proton Decay via p -> e^+ pi^0 and p -> mu^+ pi^0 in a Large Water Cherenkov Detector
• Precision Corrections to Supersymmetric Unification
• Decaying Dark Matter in Light of the PAMELA and Fermi LAT Data
• High-energy electron observations by PPB-BETS flight in Antarctica
• Antimatter Signatures of Gravitino Dark Matter Decay
• Naturally Light Higgs Doublets in the Supersymmetric Grand Unified Theories with Dynamical Symmetry Breaking
• Proton decay matrix elements with domain-wall fermions
• Upper Bound On Gluino Mass From Thermal Leptogenesis
• Deconstruction, G_2 Holonomy, and Doublet-Triplet Splitting
• R-violating Decay of Wino Dark Matter and electron/positron Excesses in the PAMELA/Fermi Experiments
• High Energy Cosmic Rays from Decaying Supersymmetric Dark Matter
• Strings versus supersymmetric GUTs: can they be reconciled?
• Beyond the CDMS-II Dark Matter Search: SuperCDMS
• Upper Bound of Proton Lifetime in Product-Group Unification
• The Stability of the Gauge Hierarchy in $SU(5)\times SU(5)$
• Product Groups, Discrete Symmetries, and Grand Unification

Cited by in corpus (7)

• Wino Dark Matter in light of the AMS-02 2015 Data
• GUTzilla Dark Matter
• Ultraviolet Completion of a Composite Asymmetric Dark Matter Model with a Dark Photon Portal
• Bottom-tau unification by neutrinos in a nonsupersymmetric SU(5) model
• Coupling Unification and Dark Matter in a Standard Model Extension with Adjoint Majorana Fermions
• NNMSM Type-II and III
• Next to new minimal standard model