Cosmic acceleration with cosmological soft phonons in a network of large
  structures
  The dark energy scalar field is here presented as a mean-field effect arising
from the collective motion of interacting structures on an expanding lattice.
This cosmological analogue to solid-state soft phonons in an unstable crystal
network is shown to produce cosmic acceleration while mimicking phantom
equation of state. From an analysis of the Hubble diagram of type Ia
supernovae, we present constraints and discussion on the parameters of the
cosmic Lagrange chain, as well as on time-variation of the soft phonon equation
of state.
