Cosmological solutions of massive gravity on de Sitter

Understand

In the framework of the recently proposed models of massive gravity, defined with respect to a de Sitter reference metric, we obtain new homogeneous and isotropic solutions for arbitrary cosmological matter and arbitrary spatial curvature.

• These solutions can be classified into three branches.
• In the first two, the massive gravity terms behave like a cosmological constant.
• In the third branch, the massive gravity effects can be described by a time evolving effective fluid with rather remarkable features, including the property to behave as a cosmological constant at late time.