At any given time, lots of them exist. I would expect this to produce a constant but rapidly changing gravitational force. How is this effect taken into account in cosmological theories?
your first virtual particles are quasiparticles1. I dont clear what you want to do but
2. There are two kind of "virtual" particles in physics concept:
- one is pseudo particles: particles stand for an energy state (vibration states in material, for example)- this kind does not cause a graviational field
- The second kind: virtual prticles which exist in a short time: in principle, this kind will cause gravitation.
Happy new year 2008