A joint reconstruction of dark energy and modified growth evolution
  We present the first combined non-parametric reconstruction of the three
time-dependent functions that capture departures from the standard cosmological
model, $\Lambda$CDM, in the expansion history and gravitational effects on
matter and light from the currently available combination of the background and
large scale structure data. We perform the reconstruction with and without a
theory-informed prior, built on the general Horndeski class of scalar-tensor
theories, that correlates the three functions. We find that the combination of
all data can constrain 15 combined eigenmodes of the three functions with
respect to the prior, allowing for an informative reconstruction of the
cosmological model featuring non-trivial time-dependences. We interpret the
latter in the context of the well-known tensions between some of the datasets
within $\Lambda$CDM, along with discussing implications of our reconstruction
for modified gravity theories.
