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- W4383176258 abstract "The recent observation of the Hellings-Downs angular correlation by NANOGrav and other PTA experiments indicates the presence of stochastic gravitational wave background in the frequency $sim 1-10$ nHz. In the clockwork axion model, the network of cosmic strings and domain walls forms after the spontaneous symmetry breaking and can survive until the QCD phase transition. The QCD axion potential induced by the QCD phase transition can serve as an energy bias, which leads to the annihilation of the domain walls. In Ref.~cite{Chiang:2020aui}, we have shown that the GWs radiated during the annihilation of the domain walls formed at the Peccei-Quinn symmetry breaking scale $fsimeq 200$~TeV can give rise to the potential signal in the NANOGrav 12.5-year data. In this work, we show that both the amplitude and the spectrum shape of the GW signals from the domain walls annihilation at a scale $f=1.69_{-0.34}^{+0.36}times 100$~TeV can well account for the NANOGrav 15-year results." @default.
- W4383176258 created "2023-07-05" @default.
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- W4383176258 date "2023-07-03" @default.
- W4383176258 modified "2023-09-27" @default.
- W4383176258 title "Nano-Hertz stochastic gravitational wave background from domain wall annihilation" @default.
- W4383176258 doi "https://doi.org/10.48550/arxiv.2307.00746" @default.
- W4383176258 hasPublicationYear "2023" @default.
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