The Campanelli-Lousto and veiled spacetimes
  The Campanelli-Lousto solutions of Brans-Dicke theory, usually reported as black holes are reconsidered and shown to describe, according to the values of a parameter, wormholes or naked singularities. The veiled Schwarzschild metric recently used as an example to discuss conformal frames and their equivalence corresponds to a special case of the CL metric. The conformal cousins of these solutions, and of the Riegert black hole solution of conformally invariant Weyl theory, are analysed, leading to a word of caution when interpreting physically spacetimes generated via conformal transformations from known seed solutions. 
Luciano Vanzo and Sergio Zerbini (University of Trento and INFN   Trento) and Valerio Faraoni (Bishop's University)
gr-qc astro-ph.CO