Marginalized Fisher Forecast for Horndeski Dark Energy Models
  We use effective field theory (EFT) formalism to forecast the constraint on
Horndeski class of dark energy models with future supernova and galaxy surveys.
Previously (Gleyzes {\it et al.}) computed unmarginalized constraints (68\% CL
error $\sim 10^{-3}$--$10^{-2}$) on EFT dark energy parameters by fixing all
other parameters. We extend the previous work by allowing all cosmological
parameters and nuisance parameters to vary and marginalizing over them. We find
that (i) the constraints on EFT dark energy parameters are typically worsen by
a factor of few after marginalization, and (ii) the constraint on the dark
energy equation of state $w$ is not significantly affected by the inclusion of
EFT dark energy parameters.
