
Minimal theory of massive gravityMinimal theory of massive gravity 
"/De Felice, Antonio/"De Felice, Antonio ,
"/Mukohyama, Shinji/"Mukohyama, Shinji
752pp.302

305 , 2016 , Elsevier B.V.
ISSN:03702693
Description
We propose a new theory of massive gravity with only two propagating degrees of freedom. 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 RhamGabadadzeTolley (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 selfaccelerating cosmological solution that was originally found in the dRGT theory. The cosmological solution in the other branch, often called the normal branch, is also rendered stable in the new theory and, for the first time, makes it possible to realize an effective equationofstate parameter different from (either larger or smaller than) 1 without introducing any extra degrees of freedom.
FullText
http://www.sciencedirect.com/science/article/pii/S0370269315009065
http://repository.kulib.kyotou.ac.jp/dspace/bitstream/2433/210263/1/j.physletb.2015.11.050.pdf