Hearing the echoes of electroweak baryogenesis with gravitational wave detectors

TL;DR

This paper combines gravitational wave detection and collider experiments to investigate electroweak baryogenesis, proposing a unified observational approach to test early universe phase transitions and CP violation mechanisms.

Contribution

It presents the first joint analysis linking gravitational wave signals and collider signatures of electroweak baryogenesis with an extended Higgs sector.

Findings

GW signals detectable by planned space-based detectors.

Collider signals observable at future electron-positron colliders.

Strong first-order phase transition consistent with baryogenesis requirements.

Abstract

We report on the first joint analysis of observational signatures from the electroweak baryogenesis in both gravitational wave (GW) detectors and particle colliders. With an effective extension of the Higgs sector in terms of the dimension-6 operators, we derive a strong first-order phase transition in associated with a sizable CP violation to realize a successful electroweak baryogenesis. We calculate the GW spectrum resulting from the bubble nucleation, plasma transportation, and magnetohydrodynamic turbulence of this process that occurred after the big bang, and find that it yields GW signals testable in Evolved Laser Interferometer Space Antenna, Deci-hertz Interferometer Gravitational wave Observatory and Big Bang Observer. We further identify collider signals from the same mechanism that are observable at the planning Circular Electron Positron Collider. Our analysis bridges astrophysics/cosmology with particle physics by providing significant motivation for searches for GW event peaking at the $(10^{-4}, 1)$ Hz range, which are associated with signals at colliders, and highlights the possibility of an interdisciplinary observational window into baryogenesis. The technique applied in analyzing early universe phase transitions may enlighten the study of phase transitions in applied science.