Is the Universe Accelerating?

The universe has fields. There are random, non-particle wiggles in them. And so maybe Anthony's wondering like, do these random wiggles have mass? And could that mass maybe account for dark matter? All the fields that are out there in the universe have energy because quantum fields can never be at zero. That's why we talk sometimes about virtual particles popping out of the vacuum. But mostly it's potential energy. Potential energy actually has the opposite effect of mass.