Cougar

I also think the vacuum of space is "boiling" but not meaning hot just turbulent because of the electromagnetic ,gravitational and who knows what energy passing through it.
When the disturbance is enough to break off a droplet that becomes a particle ,neutral with no spin,positive one way spin,negative other way spin.The equivalent of a bubble would be an anti particle.

I suggest that this constantly stretched and released space time does not relax back to its original small size but is just a tiny bit larger,space is being made from the energy of the turbulence.Space is expanding for this reason.
Matter and antimatter destroy each other and nuclear decay make turbulence,which can make matter. They interconvert . E=MC^2.