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Probing the scale of grand unification with gravitational waves

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arxiv 1912.03695 v2 pith:Y475LUOT submitted 2019-12-08 hep-ph astro-ph.COgr-qc

Wilfried Buchmuller , Valerie Domcke , Hitoshi Murayama , Kai Schmitz This is my paper
classification hep-phastro-ph.COgr-qc
keywords scalebreakinggrandgravitationalstringsunificationwavesaccount
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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^2\Omega_GW ~ 10^-8 at interferometer frequencies. Ongoing and future LIGO observations will hence probe the scale of B-L breaking.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Do Cosmic String Segments Emit Gravitational Waves?

    hep-ph 2025-07 conditional novelty 7.0 of 10

    In realistic metastable cosmic string scenarios, thermal fluctuations on the string prevent endpoint monopoles from reaching relativistic speeds, so string segments contribute negligibly to the gravitational wave background.

  2. Magnetic monopoles and high frequency gravitational waves from quasi-stable strings

    hep-ph 2026-03 conditional novelty 4.0 of 10

    SO(10) breaking through flipped SU(5) or Pati-Salam subgroups can produce GUT monopoles from merging monopole-antimonopole pairs, while the intervening quasi-stable strings emit gravitational waves from Hz to kHz.

  3. C-parity, magnetic monopoles and higher frequency gravitational waves

    hep-ph 2025-02 conditional novelty 4.0 of 10

    The C-string-wall network from SO(10) breaking with unbroken C-parity produces a gravitational wave background peaking between 100 Hz and 100 kHz for intermediate breaking scales around 10^10 to 10^12 GeV.

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