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Recently, pulsar timing array (PTA) experiments have provided compellingevidence for the existence of the nanohertz stochastic gravitational wavebackground (SGWB). In this work, we demonstrated that cosmic string loopsgenerated from cosmic global strings offer a viable explanation for theobserved nanohertz SGWB data, requiring a cosmic string tension parameter of$\log(G\mu) \sim -12$ and a loop number density of $\log N \sim 4$.Additionally, we revisited the impact of cosmic string loops on the abundanceof massive galaxies at high redshifts. However, our analysis revealedchallenges in identifying a consistent parameter space that can concurrentlyexplain both the SGWB data and observations from the James Webb SpaceTelescope. This indicates the necessity for either extending the existing modelemployed in this research or acknowledging distinct physical origins for thesetwo phenomena.

The nanohertz stochastic gravitational wave background from cosmic string loops and the abundant high redshift massive galaxies