Synergy between measurements of the gravitational wave and the triple Higgs coupling in probing first order phase transition

Understand

Probing the Higgs potential and new physics behind the electroweak symmetry breaking is one of the most important issues of particle physics.

• In particular, nature of electroweak phase transition is essential for understanding physics at the early Universe, such that the strongly first order phase transition is required for a successful scenario of electroweak baryogenesis.
• The strongly first order phase transition is expected to be tested by precisely measuring the triple Higgs boson coupling at future colliders like the International Linear Collider.
• It can also be explored via the spectrum of stochastic gravitational waves to be measured at future space-based interferometers such as eLISA and DECIGO.