Smooth thick braneworlds and the Gibbons-Kallosh-Linde no-go theorem
  After working out the so called braneworld sum rules formalism in order to encompass Gauss-Bonnet terms, the generation of thick branes is proposed, even with a periodic extra dimension, what circumvents the Gibbons-Kallosh-Linde no-go theorem in this context. 
Marco Dias, J. M. Hoff da Silva, Rold\~ao da Rocha
hep-th gr-qc