# Does a Cloud of Strings Affect Shear Viscosity Bound?

## TL;DR

This paper investigates how a cloud of strings influences the shear viscosity bound in Einstein AdS black brane solutions within massive gravity, finding violations of the KSS bound independent of the string cloud.

## Contribution

It introduces a new Einstein AdS black brane solution with a cloud of strings in massive gravity and analyzes its impact on shear viscosity to entropy density ratio.

## Key findings

- Shear viscosity to entropy density ratio violates the KSS bound.
- The ratio is unaffected by the presence of the cloud of strings.
- Violations occur under standard boundary and horizon conditions.

## Abstract

The Einstein AdS black brane with a cloud of strings background in context of massive gravity is introduced. There is a momentum dissipation on the boundary because of graviton mass on the bulk. The ratio of shear viscosity to entropy density is calculated for this solution. This value violates the KSS bound if we apply the Dirichlet boundary and regularity on the horizon conditions. Our result shows that this value is independent of the cloud of strings.