•
The inhomogeneous Chaplygin gas
based on
•
a Zel'dovich type approximation has been proposed,
• (N.B., G.B. Tupper, R.D. Viollier, PLB 535 (2002) )
•
and the picture has emerged that on caustics, where the density
•
is high, the fluid behaves as cold dark matter, whereas
•
in voids, w=p/ ρ is driven to the lower bound -1
producing
•
acceleration as dark energy.
• Soon it has been
shown that the naive Chaplygin gas model does not reproduce the
mass power spectrum
• H.B. Sandvik, M. Tegmark, M. Zaldarriaga, and I. Waga, PRD 69 (2004)
•
and the CMB
• D. Carturan and F. Finelli, PRD 68
(2003);
• L. Amendola,
F. Finelli, C. Burigana, and D. Carturan, JCAP 07
(2003)
•