Nonlinear Chaplygin Gas Cosmologies
  We study the nonlinear regime of Unified Dark Energy models, using
Generalized Chaplygin Gas cosmologies as a representative example, and
introduce a new parameter characterizing the level of small scale clustering in
these scenarios. We show that viable Generalized Chaplygin Gas cosmologies,
consistent with the most recent observational constraints, may be constructed
for any value of the Generalized Chaplygin Gas parameter by considering models
with a sufficiently high level of nonlinear clustering.
