  We propose a new theory of massive gravity with only two propagating degrees
of freedom. After defining the theory in the unitary gauge in the vielbein
language, we shall perform a Hamiltonian analysis to count the number of
physical degrees of freedom, and then study some phenomenologies. While the
homogeneous and isotropic background cosmology and the tensor linear
perturbations around it are described by exactly the same equations as those in
the de Rham-Gabadadze-Tolley (dRGT) massive gravity, the scalar and vector
gravitational degrees of freedom are absent in the new theory at the fully
nonlinear level. Hence the new theory provides a stable nonlinear completion of
the self-accelerating cosmological solution that was originally found in the
dRGT theory.
