Brane worlds at the LHC: branons and KK gravitons

@article{Cembranos2013BraneWA,
  title={Brane worlds at the LHC: branons and KK gravitons},
  author={Jos{\'e} Alberto Ruiz Cembranos and Rafael L. Delgado and Antonio Dobado},
  journal={Physical Review D},
  year={2013},
  volume={88},
  pages={075021}
}
We explore the viscosities of a photon gas by means of the Euler-Heisenberg effective theory and quantum electrodynamics at zero electron chemical potential. We find parametric estimates that show a very large shear viscosity and an extremely small bulk viscosity (reflecting the very weak coupling simultaneously with a very approximate dilatation invariance). The system is of some interest because it exemplifies very neatly the influence of the breaking of scale invariance on the bulk viscosity… 

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