New Quasidilaton theory in Partially Constrained Vielbein Formalism
  In this work we study the partially constrained vielbein formulation of the new quasidilaton theory of massive gravity which couples to both physical and fiducial metrics simultaneously via a composite effective metric. This formalism improves the new quasidilaton model since the Boulware-Deser ghost is removed fully non-linearly at all scales. This also yields crucial implications in the cosmological applications. We derive the governing cosmological background evolution and study the stability of the attractor solution. 
Antonio De Felice, A. Emir G\"umr\"uk\c{c}\"uo\u{g}lu, Lavinia   Heisenberg, Shinji Mukohyama, Norihiro Tanahashi
hep-th astro-ph.CO gr-qc