Abstract
Working within the approximation of small amplitude expansion, recently an entropy current has been constructed on the horizons of dynamical black hole solution in any higher derivative theory of gravity. In this note, we have dualized this horizon entropy current to a boundary entropy current in an asymptotically AdS black hole metric with a dual description in terms of dynamical fluids living on the AdS boundary. This boundary entropy current is constructed using a set of mapping functions relating each point on the horizon to a point on the boundary. We have applied our construction to black holes in Einstein-Gauss-Bonnet theory. We have seen that up to the first order in derivative expansion, Gauss-Bonnet terms do not add any extra corrections to fluid entropy as expected. However, at the second order in derivative expansion, the boundary current will non-trivially depend on how we choose our horizon to boundary map, which need not be expressible entirely in terms of fluid variables. So generically, the boundary entropy current generated by dualizing the horizon current will not admit a fluid dynamical description.
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Acknowledgments
We would like to thank Parthajit Biswas, Anirban Dinda and Nilay Kundu for initial collaboration, several useful discussions and many important inputs. S.B. would like to thank Shiraz Minwalla for many valuable discussions. S.R. would like to thank Sourav Dey for helpful discussions. We would also like to acknowledge our debt to the people of India for their steady and generous support to research in the basic sciences.
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Chandranathan, A., Bhattacharyya, S., Patra, M. et al. Entropy current and fluid-gravity duality in Gauss-Bonnet theory. J. High Energ. Phys. 2023, 70 (2023). https://doi.org/10.1007/JHEP09(2023)070
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DOI: https://doi.org/10.1007/JHEP09(2023)070