TeV and Superheavy Mass-Scale Particles from Supersymmetric Topological Defects, the Extragalactic Gamma-ray Background, and the Highest Energy Cosmic Rays

Abstract

Cosmic topological defects in a wide class of supersymmetric theories can simultaneously be sources of higgs particles of mass comparable to the supersymmetry breaking scale $\sim$ TeV, as well as superheavy gauge bosons of mass $\sim \eta$, where $\eta$ (>> 1 TeV) denotes the associated gauge symmetry breaking scale. For cosmic strings with $\eta \sim 10^{14}$ GeV, the higgs decay can account for the extragalactic diffuse gamma ray background above $\sim$ 10 GeV, while the gauge boson decay may explain the highest energy cosmic ray flux above $\sim 10^{11}$ GeV, provided that particle production is the dominant energy loss mechanism for cosmic strings, as recent simulations suggest. By the same token, cosmic strings with $\eta$ much above $\sim 10^{14}$ GeV will be ruled out.

4 pages, Revtex, includes 1 figure, major changes in text, arguments made more general, main conclusions unchanged, version accepted for publication in PRL

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• The nature of the Diffuse Gamma-Ray Background
• Probing Grand Unified Theories with Cosmic Ray, Gamma-Ray and Neutrino Astrophysics
• The Gravitational Wave Spectrum from Cosmological B-L Breaking
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• Photodisintegration of Ultrahigh Energy Cosmic Rays: A New Determination
• Gamma-Ray Bursts, Ultra High Energy Cosmic Rays, and Cosmic Gamma-Ray Background
• Cosmic Topological Defects, Highest Energy Cosmic Rays, and the Baryon Asymmetry of the Universe
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• Anomaly Mediation and Cosmology
• A Discussion on Supersymmetric Cosmic Strings with Gauge-Field Mixing
• Consistent cosmology with Higgs thermal inflation in a minimal extension of the MSSM
• Can thermal inflation solve the monopole problem ?
• Astrophysics at the Highest Energy Frontiers