Reconstructing Quintessence
  We present an Effective Field Theory based reconstruction of quintessence
models of dark energy directly from cosmological data. We show that current
cosmological data possess enough constraining power to test several
quintessence model properties for redshifts $z\in [0,1.5]$ with no assumptions
about the behavior of the scalar field potential. We use measurements of the
cosmic microwave background, supernovae distances, and the clustering and
lensing of galaxies to constrain the evolution of the dark energy equation of
state, Swampland Conjectures, the shape of the scalar field reconstructed
potential, and the structure of its phase space. The standard cosmological
model still remains favored by data and, within quintessence models, deviations
from its expansion history are bounded to be below the 10% level at 95%
confidence at any redshift below $z=1.5$.
