High-Temperature Electroweak Symmetry Non-Restoration from New Fermions and Implications for Baryogenesis
| Autor: | Oleksii Matsedonskyi, Geraldine Servant |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Nuclear and High Energy Physics
Particle physics FOS: Physical sciences baryogenesis 01 natural sciences Standard Model scalar [potential] singlet [fermion] Baryon asymmetry High Energy Physics - Phenomenology (hep-ph) composite [Higgs particle] asymmetry [baryon] 0103 physical sciences critical phenomena [electroweak interaction] lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ddc:530 temperature [critical phenomena] Symmetry breaking Thermal Field Theory 010306 general physics numerical calculations sphaleron plasma Physics 010308 nuclear & particles physics new physics Electroweak interaction High Energy Physics::Phenomenology Cosmology of Theories beyond the SM Goldstone particle Baryogenesis High Energy Physics - Phenomenology Higgs field Beyond Standard Model Higgs boson lcsh:QC770-798 symmetry breaking [electroweak interaction] scalar [singlet] Vacuum expectation value |
| Zdroj: | Journal of high energy physics 2020(9), 12 (1-29) (2020). doi:10.1007/JHEP09(2020)012 Journal of High Energy Physics, Vol 2020, Iss 9, Pp 1-30 (2020) Journal of High Energy Physics |
| DOI: | 10.3204/PUBDB-2020-01841 |
| Popis: | The strength of electroweak symmetry breaking may substantially differ in the early Universe compared to the present day value. In the Standard Model, the Higgs vacuum expectation value (vev) vanishes and electroweak symmetry gets restored at temperatures above $\sim 160$ GeV due to the Higgs field interactions with the high-temperature plasma. It was however shown that new light singlet scalar fields may change this behaviour. The key feature is the non-standard dependence on the Higgs vev of the new particles mass which can vanish at large Higgs vev, inducing a negative correction to the Higgs thermal mass, leading to electroweak symmetry non-restoration at high temperature. We show that such an effect can also be induced by new singlet fermions which on the other hand have the advantage of not producing unstable directions in the scalar potential at tree level, nor bringing additional severe hierarchy problems. As temperature drops, such a high-temperature breaking phase may continuously evolve into the zero-temperature breaking phase or the two phases can be separated by a temporary phase of restored symmetry. We discuss how our construction can naturally arise in motivated models of new physics, such as Composite Higgs. This is particularly relevant for baryogenesis, as it opens a whole class of possibilities in which the baryon asymmetry can be produced during a high temperature phase transition, while not being erased later by sphalerons. Comment: 23 pages, 8 figures, v2: published in JHEP with minor corrections |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|