The adhesion model as a field theory for cosmological clustering
  The adhesion model has been proposed in the past as an improvement of the
Zel'dovich approximation, providing a good description of the formation of the
cosmic web. We recast the model as a field theory for cosmological large scale
structure, adding a stochastic force to account for power generated from very
short, highly non-linear scales that is uncorrelated with the initial power
spectrum. The dynamics of this Stochastic Adhesion Model (SAM) is reminiscent
of the well known Kardar-Parisi-Zhang equation with the difference that the
viscosity and the noise spectrum are time dependent. Choosing the viscosity
proportional to the growth factor $D$ restricts the form of noise spectrum
through a 1-loop renormalization argument. For this choice, the SAM field
theory is renormalizable to one loop. We comment on the suitability of this
model for describing the non-linear regime of the CDM power spectrum and its
utility as a relatively simple approach to cosmological clustering.
