Thermodynamics of a Two-Step Electroweak Phase Transition

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http://hdl.handle.net/10138/330791

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Niemi , L , Ramsey-Musolf , M J , Tenkanen , T V I & Weir , D J 2021 , ' Thermodynamics of a Two-Step Electroweak Phase Transition ' , Physical Review Letters , vol. 126 , no. 17 , 171802 . https://doi.org/10.1103/PhysRevLett.126.171802

Title: Thermodynamics of a Two-Step Electroweak Phase Transition
Author: Niemi, Lauri; Ramsey-Musolf, Michael J.; Tenkanen, Tuomas V. I.; Weir, David J.
Other contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics

Date: 2021-04-27
Language: eng
Number of pages: 6
Belongs to series: Physical Review Letters
ISSN: 0031-9007
DOI: https://doi.org/10.1103/PhysRevLett.126.171802
URI: http://hdl.handle.net/10138/330791
Abstract: New field content beyond that of the standard model of particle physics can alter the thermal history of electroweak symmetry breaking in the early Universe. In particular, the symmetry breaking may have occurred through a sequence of successive phase transitions. We study the thermodynamics of such a scenario in a real triplet extension of the standard model, using nonperturbative lattice simulations. Two-step electroweak phase transition is found to occur in a narrow region of allowed parameter space with the second transition always being first order. The first transition into the phase of nonvanishing triplet vacuum expectation value is first order in a non-negligible portion of the two-step parameter space. A comparison with two-loop perturbative calculation is provided and significant discrepancies with the nonperturbative results are identified.
Subject: BARYON ASYMMETRY
MAGNETIC MONOPOLES
3D PHYSICS
LATTICE
CALCULATE
1ST-ORDER
ALGORITHM
UNIVERSE
114 Physical sciences
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