We put constraints on the normalized energy density in gravitaional waves from cosmic domain walls (DWs) by searching for the stochastic gravitational-wave background (SGWB) in the data of Advanced LIGO and Virgo's first three observing runs. By adopting a phenomenological broken power-law model, we obtain the upper limit of normalized energy density of SGWB generated by DWs in the peak frequency band 10∼200 Hz, and get the most stringent limitation at the peak frequency f∗=35 Hz, namely ΩDW(f∗=35Hz)<1.4×10−8 at 95% confidence level (CL). Subsequently, we work out the constraints on the parameter space in the appealing realization of DW structure -- the heavy axion model which can avoid the so-called quality problem.
@article{arxiv.2208.00697,
title = {Implications for Cosmic Domain Walls from LIGO-Virgo First Three Observing Runs},
author = {Yang Jiang and Qing-Guo Huang},
journal= {arXiv preprint arXiv:2208.00697},
year = {2022}
}