TY - JOUR

T1 - Gravitational waves from domain walls and their implications

AU - Nakayama, Kazunori

AU - Takahashi, Fuminobu

AU - Yokozaki, Norimi

N1 - Funding Information:
This work is supported by JSPS KAKENHI Grant Numbers JP15H05889 (F.T. and N.Y.), JP15K21733 (F.T. and N.Y.), JP26247042 (K.N. and F.T.), JP15H05888 (K.N.), JP26287039 (F.T.), JP26800121 (K.N.) and JP26104009 (K.N.); and by World Premier International Research Center Initiative (WPI Initiative), MEXT , Japan (K.N. and F.T.).
Publisher Copyright:
© 2017 The Author(s)

PY - 2017/7/10

Y1 - 2017/7/10

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85033449504&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85033449504&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2017.05.010

DO - 10.1016/j.physletb.2017.05.010

M3 - Article

AN - SCOPUS:85033449504

VL - 770

SP - 500

EP - 506

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -