# 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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