# Is there vacuum when there is mass? Vacuum and non-vacuum solutions for massive gravity

@article{MartnMoruno2013IsTV, title={Is there vacuum when there is mass? Vacuum and non-vacuum solutions for massive gravity}, author={Prado Mart{\'i}n-Moruno and Matt Visser}, journal={Classical and Quantum Gravity}, year={2013}, volume={30} }

Massive gravity is a theory which has a tremendous amount of freedom to describe different cosmologies, but at the same time, the various solutions one encounters must fulfil some rather nontrivial constraints. Most of the freedom comes not from the Lagrangian, which contains only a small number of free parameters (typically three depending on counting conventions), but from the fact that one is in principle free to choose the reference metric almost arbitrarily—which effectively introduces a…

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