On the validity of perturbative studies of the electroweak phase transition in the Two Higgs Doublet model
Kainulainen, K., Keus, V., Niemi, L., Rummukainen, K., Tenkanen, T. V. I., & Vaskonen, V. (2019). On the validity of perturbative studies of the electroweak phase transition in the Two Higgs Doublet model. Journal of High Energy Physics, 2019(6), Article 75. https://doi.org/10.1007/JHEP06(2019)075
Published inJournal of High Energy Physics
© The Authors, 2019.
Making use of a dimensionally-reduced effective theory at high temperature, we perform a nonperturbative study of the electroweak phase transition in the Two Higgs Doublet model. We focus on two phenomenologically allowed points in the parameter space, carrying out dynamical lattice simulations to determine the equilibrium properties of the transition. We discuss the shortcomings of conventional perturbative approaches based on the resummed effective potential — regarding the insufficient handling of infrared resummation but also the need to account for corrections beyond 1-loop order in the presence of large scalar couplings — and demonstrate that greater accuracy can be achieved with perturbative methods within the effective theory. We find that in the presence of very large scalar couplings, strong phase transitions cannot be reliably studied with any of the methods.
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis work was supported by the Academy of Finland grants 318319 and 308791. VK acknowledges the H2020-MSCA-RISE-2014 grant no. 645722 (NonMinimalHiggs). LN was supported by the Jenny and Antti Wihuri Foundation, TT by the Swiss National Science Foundation (SNF) under grant 200020-168988 and VV by the U.K. STFC Grant ST/P000258/1.
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