Abstract
Om diagnostic is a useful geometric method to differentiate between different cosmological models without the accurate current value of matter density. We investigate the Om diagnostic for viscous Cardassian universe and find that the model can be easily distinguished from LCDM. We also investigate the influence of the bulk viscosity coefficient τ on the evolutive behavior of Om with respect to redshift z. According to the value of Om(z=0) for viscous Cardassian models, we obtain the current value of equation of state w k0.
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This work is partially supported by Natural Science Foundation of Jiangsu Province under Grant No. BK2011397.
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Xu, Y.D., Huang, Z.G. Om diagnostic for viscous Cardassian universe. Astrophys Space Sci 342, 493–498 (2012). https://doi.org/10.1007/s10509-012-1166-7
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DOI: https://doi.org/10.1007/s10509-012-1166-7