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We study a new source of stochastic gravitational wave background (SGWB) fromthe final collapse of a string-wall network. In the context of $N_{\rm DW}=1$axionic string-wall network, the final collapse of walls bounded by strings canrelease gravitational waves (GWs). This source is typically considerednegligible due to its subdominance compared to GW emissions throughout thelong-term evolution in the scaling regime. However, in some cases, a networkcan be driven outside of horizon by inflation and later re-enter horizon. Then,the network's final collapse after re-entering horzion becomes the dominant GWsource and therefore cannot be neglected. Our caculation of the correspondingGW spectrum suggests it could potentially explain the nano-Hertz SGWB signalpossibly detected by various Pulsar Timing Array experiments. In addition, withdifferent parameter choices, the resultant GWs could be probed by various GWinterferometry experiments.

Stochastic gravitational wave background: birth from axionic string-wall death