  Gravity constrains the range of validity of quantum field theory. As has been
pointed out by Cohen, Kaplan, and Nelson (CKN), such effects lead to
interdependent ultraviolet (UV) and infrared (IR) cutoffs that may stabilize
the dark energy of the universe against quantum corrections, if the IR cutoff
is set by the Hubble horizon. As a consequence of the cosmic expansion, this
argument implies a time-dependent dark energy density. In this paper we
confront this idea with recent data from DESI BAO, Hubble and supernova
measurements. We find that the CKN model provides a better fit to the data than
the $\Lambda$CDM model and can compete with other models of time-dependent dark
energy that have been studied so far.
