Gravitational waves from domain walls and their implications

Kazunori Nakayama, Fuminobu Takahashi, Norimi Yokozaki

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)500-506
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume770
DOIs
Publication statusPublished - 2017 Jul 10

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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