Domain wall constraints on two-Higgs-doublet models with Z2 symmetry
I got a few things from this reference that addresses a false vacuum that has developed inside the universe. This false vacuum is what the EVO is.
A two-Higgs-doublet model is the story of a spacetime where two Higgs fields exist. This happens when a false vacuum develops. When this two vacuum state occurs, a domain wall forms.
QuoteDisplay MoreDomain walls are topological defects that emerge from
the breaking of discrete symmetries [1], resulting in a
vacuum manifold containing topologically disconnected
points. These disconnected points correspond to degenerate
vacua. Phase transitions producing domain walls occur at a
finite rate, and as such, the field can select different vacua in
causally disconnected regions of space. This divides the
Universe into so-called domains; the interfaces between
which are domain walls
This says that when a EVO forms, so does a domain wall that keeps the two Higgs field separated. Each Higgs field as a different vacuum expectation value... these vacuums a different. Being causally disconnected means that what happens inside the EVO is not observable or causes any reactions in spacetime. "This divides the Universe into so-called domains" this means that there are now two universes formed. This is the so-called two-Higgs-doublet model (2HDM) is what we call the EVO.
QuoteTHE TWO HIGGS DOUBLET MODEL WITH
SOFTLY BROKEN Z2 SYMMETRY
Under a Z2 transformation the complex scalar Higgs
doublets, Φ1 and Φ2, transform as
Φ1 → Φ1; Φ2 → −Φ2:
This says that the EVO will be the anti Higgs field of the universe.
to be continued...