Clustering GCG: a viable option for unified dark matter-dark energy?

Understand

We study the clustering Generalized Chaplygin Gas (GCG) as a possible candidate for dark matter-dark energy unification.

• The vanishing speed of sound ($c_{s}^2 = 0$) for the GCG fluid can be obtained by incorporating higher derivative operator in the original K-essence Lagrangian.
• The evolution of the density fluctuations in the GCG+Baryon fluid is studied in the linear regime.
• The observational constraints on the model are obtained using latest data from SNIa, $H(z)$, BAO and also for the $f\sigma_{8}$ measurements.