Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/01/012
Keywords
baryon asymmetry; particle physics - cosmology connection; cosmological phase transitions; cosmology of theories beyond the SM
Funding
- Science and Technology Facilities Council [ST/K001728/1, ST/G000581/1, ST/J000434/1] Funding Source: researchfish
- STFC [ST/J000434/1, ST/K001728/1, ST/G000581/1] Funding Source: UKRI
- ICREA Funding Source: Custom
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We address electroweak baryogenesis in the context of composite Higgs models, pointing out that modifications to the Higgs and top quark sectors can play an important role in generating the baryon asymmetry. Our main observation is that composite Higgs models that include a light, gauge singlet scalar in the spectrum [as in the model based on the symmetry breaking pattern SO(6) -> SO(5)], provide all necessary ingredients for viable baryogenesis. In particular, the singlet leads to a strongly first-order electroweak phase transition and introduces new sources of CP violation in dimension-five operators involving the top quark. We discuss the amount of baryon asymmetry produced and the experimental constraints on the model.
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