Electroweak Phase Transition in Scale Invariant Standard Model
release_rev_9865bfe0-d461-4b72-9ccb-a4e1b3a92a02
by
Parsa Hossein Ghorbani
2018
Abstract
In an extension to the scale invariant standard model by two real singlet
scalars s and s' in addition to the Higgs field, we investigate the strong
first-order electroweak phase transition as a requirement for baryogenesis.
This is the minimal extension to the scale invariant standard model with two
extra degrees of freedom that possesses the physical Higgs mass of 125 GeV.
The scalar s' being stable because of the Z_2 discrete symmetry is
taken as the dark matter candidate. We then show that the electroweak phase
transition is strongly first-order, the dark matter relic density takes the
desired value Ω_DMh^2 ∼ 0.11, and the constraints from
direct detection experiments are respected only if m_s'≡ m_DM≳ 4.5 TeV. The model also puts a lower bound on the scalon mass, m_s
≳ 200 GeV.
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1711.11541v3
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