In quantum field theory (QFT), virtual particles are mathematical entities that appear as intermediate states in calculations. They are not directly observable but are used to represent interactions between particles. Virtual particles do not exist as free particles in the same way that real particles do. Therefore, the concept of virtual particles being "ejected" as real particles due to interference with an electric field is not accurate.
However, in some cases, the presence of an external field can influence particle interactions and affect the outcome of a process. For example, in the context of quantum electrodynamics (QED), the theory describing the electromagnetic force, external electric or magnetic fields can affect the behavior of charged particles.
In QED, charged particles, such as electrons, can emit and absorb photons, which are the quanta of the electromagnetic field. This process is called particle "pair creation" and "annihilation." It involves the creation of a virtual electron-positron pair, followed by their subsequent recombination. The virtual pair exists for a brief moment and contributes to the overall behavior of the system.
When an external electric field is present, it can influence the dynamics of the charged particles, affecting their propagation and interactions. This can lead to phenomena such as particle acceleration or scattering, but it does not result in the virtual particles being "ejected" as real particles.
It's important to note that the behavior of particles in QFT is described by mathematical formalism, and the interpretation of these mathematical expressions can sometimes be challenging. Virtual particles are a useful tool in calculations, but they should not be understood as independent entities with the same properties as real particles. Instead, they represent intermediate states that contribute to the overall behavior of a quantum system.