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We estimate the stochastic gravitational wave background from the quasistable cosmic strings. The strong evidence of stochastic gravitational wave background in the NANOGrav 15 year data can be explained by the superheavy quasistable strings with dimensionless string tension \(G\mu \approx 3\times 10^{-8}- 4\times 10^{-5}\) (where G is Newton’s gravitational constant and \(\mu \) denotes the string tension) and horizon reentry time of the monopoles \(t_M\approx 10^0-8\times 10^4\) s at the 95% credible interval.

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Gravitational Waves from Quasistable Cosmic Strings and Pulsar Timing Array Data

  • 会议论文

  • 发表日期：

    2025年

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  • Rinku Maji,
  • Qaisar Shafi

摘要

We estimate the stochastic gravitational wave background from the quasistable cosmic strings. The strong evidence of stochastic gravitational wave background in the NANOGrav 15 year data can be explained by the superheavy quasistable strings with dimensionless string tension \(G\mu \approx 3\times 10^{-8}- 4\times 10^{-5}\) (where G is Newton’s gravitational constant and \(\mu \) denotes the string tension) and horizon reentry time of the monopoles \(t_M\approx 10^0-8\times 10^4\) s at the 95% credible interval.