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Gravitational waves from metastable cosmic strings in Pati-Salam model in light of new pulsar timing array data

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arxiv 2308.13248 v1 pith:K24VT2O3 submitted 2023-08-25 hep-ph astro-ph.HEgr-qchep-th

Waqas Ahmed , Talal Ahmed Chowdhury , Salah Nasri , Shaikh Saad This is my paper · ORCID
classification hep-phastro-ph.HEgr-qchep-th
keywords cosmicdatagravitationalmetastableobservedpati-salamstringsmodel
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A series of pulsar timing arrays (PTAs) recently observed gravitational waves at the nanohertz frequencies. Motivated by this remarkable result, we present a novel class of Pati-Salam models that give rise to a network of metastable cosmic strings, offering a plausible explanation for the observed PTA data. Besides, we introduce a hybrid inflationary scenario to eliminate magnetic monopoles that arise during the spontaneous symmetry breaking of the Pati-Salam gauge group to the Standard Model. The resulting scalar spectral index is compatible with Planck data, and the tensor-to-scalar ratio is anticipated to be extremely small. Moreover, we incorporate a non-thermal leptogenesis to generate the required baryon asymmetry in our framework. Finally, the gravitational wave spectra generated by the metastable cosmic strings not only correspond to signals observed in recent PTAs, including NANOGrav, but are also within the exploration capacity of both present and future ground-based and space-based experiments.

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Cited by 4 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. LISA Reconstruction Landscape for Metastable Cosmic Strings

    hep-ph 2026-07 conditional novelty 6.0 of 10

    LISA can reconstruct metastable cosmic-string tension and lifetime when it samples the tail-to-plateau transition, with residual κ_CS sensitivity possible even in high-SNR plateau-like spectra.

  3. Gravitational Waves from Metastable Cosmic Strings in Supersymmetric New Inflation Model

    hep-ph 2024-11 conditional novelty 6.0 of 10

    A supersymmetric new inflation model with a two-step SU(2) to U(1) to nothing symmetry breaking yields metastable cosmic strings with GUT-scale tension, able to match the PTA signal while evading LIGO-Virgo-KAGRA cons...

  4. Pre-Big-Bang Cosmology Cannot Explain NANOGrav 15-year Signal

    astro-ph.CO 2024-11 conditional novelty 4.0 of 10

    Pre-Big Bang string cosmology cannot explain the NANOGrav 15-year signal; a power-law spectrum is preferred by a Bayes factor of about 468.

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