Test of the cosmic evolution using Gaussian processes
  Much focus was on the possible slowing down of cosmic acceleration under the
dark energy parametrization. In the present paper, we investigate this subject
using the Gaussian processes (GP), without resorting to a particular template
of dark energy. The reconstruction is carried out by abundant data including
luminosity distance from Union2, Union2.1 compilation and gamma-ray burst, and
dynamical Hubble parameter. It suggests that slowing down of cosmic
acceleration cannot be presented within 95\% C.L., in considering the influence
of spatial curvature and Hubble constant. In order to reveal the reason of
tension between our reconstruction and previous parametrization constraint for
Union2 data, we compare them and find that slowing down of acceleration in some
parametrization is only a "mirage". Although these parameterizations fits well
with the observational data, their tension can be revealed by high order
derivative of distance $D$. Instead, GP method is able to faithfully model the
cosmic expansion history.
