Large Anisotropies of the Stochastic Gravitational Wave Background from Cosmic Domain Walls

We investigate the stochastic gravitational wave background (SGWB) from cosmic domain walls (DWs) caused by quantum fluctuations of a light scalar field $\phi$ during inflation. Perturbations remain almost constant after leaving Hubble horizon. The probabilities two domains depend on averaged value at each large scale region, leading to perturbations DW energy density and anisotropies in SGWB. find that angular power spectrum is scale-invariant least order $10^{-2}$, which expected be detected future gravitational-wave (GW) detectors. Since we have not primordial GWs yet, SGWB could help us verify rationality inflation determine