Vacuum Polarization in the Spacetime of a Scalar-Tensor Cosmic String
  We study the vacuum polarization effect in the spacetime generated by a magnetic flux cosmic string in the framework of a scalar-tensor gravity. The vacuum expectation values of the energy-momentum tensor of a conformally coupled scalar field are calculated. The dilaton's contribution to the vacuum polarization effect is shown explicitly. 
V. B. Bezerra (UFPb), R. M. Teixeira Filho (UFPb and UFBA), G. Grebot   (UnB) and M. E. X. Guimaraes (UnB)