Viscosity bound and causality violation.

@article{Brigante2008ViscosityBA,
  title={Viscosity bound and causality violation.},
  author={Mauro Brigante and Hong Liu and Robert C. Myers and Stephen Shenker and Sho Yaida},
  journal={Physical review letters},
  year={2008},
  volume={100 19},
  pages={191601}
}
In recent work we showed that, for a class of conformal field theories (CFT) with Gauss-Bonnet gravity dual, the shear viscosity to entropy density ratio, eta/s, could violate the conjectured Kovtun-Starinets-Son viscosity bound, eta/s > or = 1/4 pi. In this Letter we argue, in the context of the same model, that tuning eta/s below (16/25)(1/4 pi) induces microcausality violation in the CFT, rendering the theory inconsistent. This is a concrete example in which inconsistency of a theory and a… CONTINUE READING
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