Gravitational waves from domain walls and their implications

Kazunori Nakayama; Fuminobu Takahashi; Norimi Yokozaki

doi:10.1016/j.physletb.2017.05.010

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arXiv · 1612.08327

Gravitational waves from domain walls and their implications

Kazunori Nakayama·Fuminobu Takahashi·Norimi Yokozaki

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Abstract

We evaluate the impact of domain-wall annihilation on the currently ongoing and planned gravitational wave experiments, including a case in which domain walls experience a frictional force due to interactions with the ambient plasma. We show the sensitivity reach in terms of physical parameters, namely, the wall tension and the annihilation temperature. We find that a Higgs portal scalar, which stabilizes the Higgs potential at high energy scales, can form domain walls whose annihilation produces a large amount of gravitational waves within the reach of the advanced LIGO experiment (O5). Domain wall annihilation can also generate baryon asymmetry if the scalar is coupled to either SU(2)$_L$ gauge fields or the $(B-L)$ current. This is a variant of spontaneous baryogenesis, but it naturally avoids the isocurvature constraint due to the scaling behavior of the domain-wall evolution. We delineate the parameter space where the domain-wall baryogenesis works successfully and discuss its implications for the gravitational wave experiments.

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Kazunori Nakayama, Fuminobu Takahashi, Norimi Yokozaki. 2016-12-26. Gravitational waves from domain walls and their implications. https://doi.org/10.1016/j.physletb.2017.05.010

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