Statefinders and observational measurement of superenergy
  The superenergy of the universe is a tensorial quantity and it is a general
relativistic analogue of the Appell's energy of acceleration in classical
mechanics. We propose the measurement of this quantity by the observational
parameters such as the Hubble parameter, the deceleration parameter, the jerk
and the snap (kerk) known as statefinders. We show that the superenergy of
gravity requires only the Hubble and deceleration parameter to be measured,
while the superenergy of matter requires also the measurement of the
higher-order characteristics of expansion: the jerk and the snap. In such a
way, the superenergy becomes another parameter characterizing the evolution of
the universe.
