Baryogenesis and gravity waves from a UV-completed electroweak phase transition
Laurent, B., Cline, J. M., Friedlander, A., He, D.-M., Kainulainen, K., & Tucker-Smith, D. (2021). Baryogenesis and gravity waves from a UV-completed electroweak phase transition. Physical Review D, 103(12), Article 123529. https://doi.org/10.1103/PhysRevD.103.123529
Published inPhysical Review D
© Authors. Published by the American Physical Society. Funded by SCOAP3. 2021
We study gravity wave production and baryogenesis at the electroweak phase transition in a real singlet scalar extension of the Standard Model, including vectorlike top partners, to generate the CP violation needed for electroweak baryogenesis (EWBG). The singlet makes the phase transition strongly first order through its coupling to the Higgs boson, and it spontaneously breaks CP invariance through a dimension-five contribution to the top quark mass term, generated by integrating out the heavy top quark partners. We improve on previous studies by incorporating updated transport equations, compatible with large bubble wall velocities. The wall speed and thickness are computed directly from the microphysical parameters rather than treating them as free parameters, allowing for a first-principles computation of the baryon asymmetry. The size of the CP-violating dimension-five operator needed for EWBG is constrained by collider, electroweak precision, and renormalization group running constraints. We identify regions of parameter space that can produce the observed baryon asymmetry or observable gravitational wave (GW) signals. Contrary to standard lore, we find that for strong deflagrations, the efficiencies of large baryon asymmetry production and strong GW signals can be positively correlated. However, we find the overall likelihood of observably large GW signals to be smaller than estimated in previous studies. In particular, only detonation-type transitions are predicted to produce observably large gravitational waves. ...
PublisherAmerican Physical Society (APS)
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThe work of J. C. and B. L. was supported by the Natural Sciences and Engineering Research Council (Canada). The work of B. L. was also supported by the Fonds de recherche Nature et technologies (Québec). The work of K. K. was supported by the Academy of Finland Grant No. 318319.
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