Quantum corrections for the cubic Galileon in the covariant language
  We present for the first time an explicit exposition of quantum corrections
within the cubic Galileon theory including the effect of quantum gravity, in a
background- and gauge-invariant manner, employing the field-reparametrisation
approach of the covariant effective action at 1-loop. We show that the
consideration of gravitational effects in combination with the non-linear
derivative structure of the theory reveals new interactions at the perturbative
level, which manifest themselves as higher-operators in the associated
effective action, which' relevance is controlled by appropriate ratios of the
cosmological vacuum and the Galileon mass scale. The significance and concept
of the covariant approach in this context is discussed, while all calculations
are explicitly presented.
