1. In Current Science, a particle that possess mass or energy for a limited time. As long as the energy of the particle multiplied by the time of it existence is less than Planck’s constant h, Heisenberg’s Uncertainty Principle is not violated, and the particle is not forbidden to exist.
Despite their brief lifetimes virtual particles are considered “real” things that transfer force over a very short distance, e.g., in the Standard Theory of Particle Physics the strong nuclear force (the color force) is transmitted by the exchange of virtual particles called “gluons.”
2. In Neu Theory there are no virtual particles.
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