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Cosmological perturbations of massive gravity coupled to DBI Galileons
Melinda Andrews, Kurt Hinterbichler, James Stokes +1
Certain scalar fields with higher derivative interactions and novel classical and quantum mechanical properties - the Galileons - can be naturally covariantized by coupling to nonl…
Massive gravity coupled to DBI Galileons is ghost free
Melinda Andrews, Garrett Goon, Kurt Hinterbichler +2
It is possible to couple Dirac-Born-Infeld (DBI) scalars possessing generalized Galilean internal shift symmetries (Galileons) to nonlinear massive gravity in four dimensions, in s…
Cosmologies of extended massive gravity
Kurt Hinterbichler, James Stokes, Mark Trodden
We study the background cosmology of two extensions of dRGT massive gravity. The first is variable mass massive gravity, where the fixed graviton mass of dRGT is replaced by the ex…