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Unitarity constraints on the ratio of shear viscosity to entropy density in higher derivative gravity
We discuss corrections to the ratio of shear viscosity to entropy density $\eta/s$ in higher-derivative gravity theories. Generically, these theories contain ghost modes with Planck-scale masses. Motivated by general considerations about unitarity, we propose new boundary conditions for the equation...
| Autores principales: | , |
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| Lenguaje: | eng |
| Publicado: |
2010
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.83.126005 http://cds.cern.ch/record/1268581 |