CONFORMAL ANOMALY FOR DILATON COUPLED ELECTROMAGNETIC-FIELD

The derivation of the conformal anomaly for dilaton coupled electromag netic field in curved space is presented. The models of this sort natu rally appear in stringy gravity or after spherical reduction Of multid imensional Einstein-Maxwell theory. It is shown that unlike the case o f minimal vector in curved space or dilaton coupled scalar the anomaly induced effective action cannot be derived. The reason is the same wh y anomaly induced effective action cannot be constructed for interacti ng theories (like QED) in curved space. (C) 1998 Elsevier Science B.V. All rights reserved.