Weakly Broken Galileon Symmetry
  Effective theories of a scalar $\phi$ invariant under the internal
\textit{galileon symmetry} $\phi\to\phi+b_\mu x^\mu$ have been extensively
studied due to their special theoretical and phenomenological properties. In
this paper, we introduce the notion of \textit{weakly broken galileon
invariance}, which characterizes the unique class of couplings of such theories
to gravity that maximally retain their defining symmetry. The curved-space
remnant of the galileon's quantum properties allows to construct (quasi) de
Sitter backgrounds largely insensitive to loop corrections. We exploit this
fact to build novel cosmological models with interesting phenomenology,
relevant for both inflation and late-time acceleration of the universe.
