Probing the scale of grand unification with gravitational waves

Abstract

The spontaneous breaking of U(1)_B-L around the scale of grand unification can simultaneously account for hybrid inflation, leptogenesis, and neutralino dark matter, thus resolving three major puzzles of particle physics and cosmology in a single predictive framework. The B-L phase transition also results in a network of cosmic strings. If strong and electroweak interactions are unified in an SO(10) gauge group, containing U(1)_B-L as a subgroup, these strings are metastable. In this case, they produce a stochastic background of gravitational waves that evades current pulsar timing bounds, but features a flat spectrum with amplitude h^2Ω_GW ~ 10^-8 at interferometer frequencies. Ongoing and future LIGO observations will hence probe the scale of B-L breaking.

6 pages, 3 figures. v2: updated references, matches version published in PLB

References in corpus (5)

• Supersymmetric Hybrid Inflation with Non-Minimal Kahler potential
• Spontaneous B-L Breaking as the Origin of the Hot Early Universe
• Hybrid Inflation in the Complex Plane
• The spontaneous breaking of a metastable string
• WIMP Dark Matter from Gravitino Decays and Leptogenesis

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