2018
DOI: 10.1016/j.astropartphys.2017.11.002
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Abstract: The generalized Chaplygin gas cosmology provides a prime example for the class of unified dark matter models, which substitute the two dark components of the standard cosmological ΛCDM concordance model by a single dark component. The equation of state of the generalized Chaplygin gas is characterised by a parameter α such that the standard ΛCDM model is recovered in the case α = 0 with respect to the background dynamics and the cosmic microwave background (CMB) statistics. This allows to investigate the conco… Show more

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Cited by 8 publications
(13 citation statements)
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References 53 publications
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“…For instance, when the effective number of relativistic species is fixed in the standard value, N eff = 3.04, a slightly positive mean value is preferred for the interaction parameter. This is in agreement with CMB joint analyses performed with different datasets [70], highlighting a contrast with the preference for negative values found with background and LSS probes [71,72].…”
Section: Analysis and Resultssupporting
confidence: 89%
See 1 more Smart Citation
“…For instance, when the effective number of relativistic species is fixed in the standard value, N eff = 3.04, a slightly positive mean value is preferred for the interaction parameter. This is in agreement with CMB joint analyses performed with different datasets [70], highlighting a contrast with the preference for negative values found with background and LSS probes [71,72].…”
Section: Analysis and Resultssupporting
confidence: 89%
“…This is contrary to the results of previous works, where negative values of α were preferred at 2σ level using LSS (2dFGRS), SNe Ia (JLA) and the position of the first peak of CMB [71]. At the same time, our results are in good agreement with more recent results where values of the interaction parameter close to zero were obtained from LSS and CMB data [6,19,70].…”
Section: Final Remarkscontrasting
confidence: 79%
“…In a previous work [1], it was shown that a joint analysis of the CMB (Planck 2015) data and SNe observations constrains the interaction parameter α of a particular class of iDE models to be slightly positive, corroborating results of similar studies [23,24]. Moreover, a strong correlation was found between α, the Hubble constant (H 0 ), and the normalization of the matter power spectrum on scales of 8h −1 Mpc (σ 8 ), i.e., while a positive interaction parameter favours higher values of H 0 , a negative α favours lower values of σ 8 .…”
Section: Introductionsupporting
confidence: 71%
“…While, regarding the maximum momentum (µ 0 > 0) within the FRW background, only shows a stable static universe with closed spatially geometry. As a consequence, our results are essentially independent of the free parameters of equation-of-states of Chaplygin gas models, which are constrained by experiments [22][23][24][25][26].…”
Section: Concluding Discussionmentioning
confidence: 71%