Falsifying $\Lambda$CDM: Model-independent tests of the concordance
  model with eBOSS DR14Q and Pantheon
  We combine model-independent reconstructions of the expansion history from
the latest Pantheon supernovae distance modulus compilation and measurements
from baryon acoustic oscillation to test some important aspects of the
concordance model of cosmology namely the FLRW metric and flatness of spatial
curvature. We then use the reconstructed expansion histories to fit growth
measurement from redshift-space distortion and obtain strong constraints on
$(\Omega_\mathrm{m},\gamma,\sigma_8)$ in a model independent manner. Our
results show consistency with a spatially flat FLRW Universe with general
relativity to govern the perturbation in the structure formation and the
cosmological constant as dark energy. However, we can also see some hints of
tension among different observations within the context of the concordance
model related to high redshift observations ($z > 1$) of the expansion history.
This supports earlier findings of Sahni et al. (2014) & Zhao et al. (2017) and
highlights the importance of precise measurement of expansion history and
growth of structure at high redshifts.
