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Gravitational Waves from Quasi-stable Strings

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arxiv 2203.11204 v2 pith:3X54SNCG submitted 2022-03-20 hep-ph astro-ph.COhep-th

George Lazarides , Rinku Maji , Qaisar Shafi This is my paper · ORCID
classification hep-phastro-ph.COhep-th
keywords stringgravitationalspectrumstringsbreakingnetworkquasi-stablestable
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We estimate the stochastic gravitational wave spectrum emitted from a network of cosmic strings in which the latter are effectively stable against breaking by monopole pair creation. The monopoles are produced at a higher scale from an earlier symmetry breaking and experience significant inflation before reentering the horizon. This gives rise to monopole-antimonopole pairs connected by string segments and the string loop formation essentially ceases. As a consequence, the lower frequency portion of the gravitational wave spectrum is suppressed relative to the no-inflation case with stable strings, which evades the stringent PPTA bound on the dimensionless string tension $G\mu$. We display the modified spectrum, accessible in the ongoing and future experiments, for $G\mu$ values in the range $10^{-10} - 10^{-15}$. We show how this `quasi-stable' string network is realized in realistic grand unified theories.

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Forward citations

Cited by 5 Pith papers

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

  1. Metastable cosmic strings are broken at the start

    hep-ph 2026-01 conditional novelty 7.0 of 10

    Metastable cosmic-string networks are typically broken within a Hubble time of formation by finite-temperature effects or by pre-existing monopoles, so matching NANOGrav requires m_M^2/μ ≳ 10^3.

  2. Searching Stochastic Gravitational Wave Background Landscape Across Frequency Bands

    gr-qc 2025-11 conditional novelty 5.0 of 10

    A hybrid cosmic string–domain wall model can fit the NANOGrav 15-year signal, and its high-frequency tail lies within LISA's projected reach, making the interpretation testable.

  3. Fermion masses and mixings in supersymmetric SO(10) with third-generation quasi-Yukawa unification

    hep-ph 2025-06 conditional novelty 5.0 of 10

    A supersymmetric SO(10) fit with a new dimension-six operator reproduces fermion masses and mixings (chi^2 = 8.8) and yields quasi-Yukawa unification y_t approx y_b approx 0.73 y_tau.

  4. Monopoles, Strings, Walls and Gravitational waves

    hep-ph 2026-07 conditional novelty 4.0 of 10

    Breaking SU(2) flavor gauge symmetry stepwise to nothing leaves monopoles, strings, and walls; collapsing walls can form composite strings whose gravitational-wave spectra fit PTA data and lie within reach of LVK and ...

  5. 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.

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