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Revisit of cosmic age problem · Around

2010

Revisit of cosmic age problem

Wang, Shuang, Li, Xiao-Dong, Li, Miao

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We investigate the cosmic age problem associated with 9 extremely old globular clusters in M31 galaxy and 1 very old high-$z$ quasar APM 08279 + 5255 at $z=3.91$.

These 9 globular clusters have not been used to study the cosmic age problem in the previous literature.
By evaluating the age of the universe in the $\Lambda$CDM model with the observational constraints from the SNIa, the BAO, the CMB, and the independent $H_0$ measurements, we find that the existence of 5 globular clusters and 1 high-$z$ quasar are in tension (over 2$\sigma$ confidence level) with the current cosmological observations.
So if the age estimates of these objects are correct, the cosmic age puzzle still remains in the standard cosmology.

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