Non-trivial classical backgrounds with vanishing quantum corrections

Details Non-trivial classical backgrounds with vanishing quantum corrections Non-trivial classical backgrounds with vanishing quantum corrections

1997-03-05

arxiv.org/abs/hep-th/9703034v1

Phys.Rev. D55 (1997) 6147-6154

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, Revtex, Accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.55.6147

Vacuum polarization and particle production effects in classical electromagnetic and gravitational backgrounds can be studied by the effective lagrangian method. Background field configurations for which the effective lagrangian is zero are special in the sense that the lowest order quantum corrections vanishes for such configurations. We propose here the conjecture that there will be neither particle production nor vacuum polarization in classical field configurations for which all the scalar invariants are zero. We verify this conjecture, by explicitly evaluating the effective lagrangian, for non-trivial electromagnetic and gravitational backgrounds with vanishing scalar invariants. The implications of this result are discussed.

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