Tackling non-linearities with the effective field theory of dark energy and modified gravity

Understand

We present the extension of the effective field theory framework to the mildly non-linear scales.

• The effective field theory approach has been successfully applied to the late time cosmic acceleration phenomenon and it has been shown to be a powerful method to obtain predictions about cosmological observables on linear scales.
• However, mildly non-linear scales need to be consistently considered when testing gravity theories because a large part of the data comes from those scales.
• Thus, non-linear corrections to predictions on observables coming from the linear analysis can help in discriminating among different gravity theories.