Cosmic strings, inflation, and gravity waves

We investigate the impact of Coleman-Weinberg inflation on stochastic gravity wave background spectrum emitted by intermediate-scale cosmic strings. The string network is partially inflated and reenters horizon at later times after end inflation, such that short loops are not produced. This leads to a significant modification we explore in detail. find can help satisfy Parkes Pulsar Timing Array (PPTA) bound for dimensionless tension values range $G\ensuremath{\mu}>1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$. also identify modified spectra which, case compatible with North American Nanohertz Observatory Gravitational Waves (NANOGrav) data. then discuss formation monopoles strings same breaking scale compatibility Monopole, Astrophysics Cosmic Ray (MACRO) PPTA bound, NANOGrav Finally, an example realistic nonsupersymmetric ${E}_{6}$ model incorporating successful presented which both survive present observable level.