The problem of the source of the Kerr-Newman metric: The volume Casimir effect and superdense pseudovacuum state

The material of the Kerr-Newman metric source ought to have an exotic pseudovacuum character with zero energy density and negative pressure. We show that such a matter source can be simulated by the volume Casimir energy. The cut-off parameter in the expression for this energy is connected with the interatomic distance d. The negative contribution of the volume Casimir energy increases as d-4, which may lead to the pseudovacuum state for superdense matter. (orig.)