Re: Bubble of the true void expanding at the speed of light
Doesn't have to be dark inside the lower-vacuum-state bubble, unless I've missed something. There will still be elementary particles and photons, and probably eventually atoms, though they'll have different properties due to changes in shell energies and the like.
Also, I don't see why a metastable Higgs would necessarily cause collapse to zero vacuum energy. Surely there could be local minima between our current state and zero?
But this really isn't my area, so I may be wildly incorrect.