Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5487911 | Physics of the Dark Universe | 2017 | 11 Pages |
Abstract
Yes, but only for a parameter value that makes it almost coincide with the standard model. We reconsider the cosmological dynamics of a generalized Chaplygin gas (gCg) which is split into a cold dark matter (CDM) part and a dark energy (DE) component with constant equation of state. This model, which implies a specific interaction between CDM and DE, has a ÎCDM limit and provides the basis for studying deviations from the latter. Including matter and radiation, we use the (modified) CLASS code (Blas et al., 2011) to construct the CMB and matter power spectra in order to search for a gCg-based concordance model that is in agreement with the SNIa data from the JLA sample and with recent Planck data. The results reveal that the gCg parameter α is restricted to |α|â²0.05, i.e., to values very close to the ÎCDM limit α=0. This excludes, in particular, models in which DE decays linearly with the Hubble rate.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
R.F. vom Marttens, L. Casarini, W. Zimdahl, W.S. Hipólito-Ricaldi, D.F. Mota,