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Many dark energy models fail to pass the cosmic age test because of the old quasar APM 08279+5255 at redshift z = 3.91, the ΛCDM model and holographic dark energy models being no exception. In this paper, we focus on the topic of the age problem in the new agegraphic dark energy (NADE) model. We determine the age of the universe in the NADE model by fitting the observational data, including type Ia...
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