Cardassian Universe Constrained by Latest Observations
Chao-Jun Feng, Xin-Zhou Li
TL;DR
This paper constrains various Cardassian universe models using recent observational data from supernovae, CMB, and BAO, exploring flat and curved geometries and the effects of bulk viscosity.
Contribution
It provides the first comprehensive constraints on multiple Cardassian models with latest observational data, including effects of bulk viscosity.
Findings
Certain models are consistent with observations
Spatial curvature impacts model viability
Bulk viscosity influences cosmological parameter estimates
Abstract
Several Cardassian universe models including the original, modified polytropic and exponential Cardassian models are constrained by the latest Constitution Type Ia supernova data, the position of the first acoustic peak of CMB from the five years WMAP data and the size of baryonic acoustic oscillation peak from the SDSS data. Both the spatial flat and curved universe are studied, and we also take account of the possible bulk viscosity of the matter fluid in the flat universe case.
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