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Another possible crisis for the standard cosmological model?
An old quasar in a young dark energy-dominated universe?
(for example: Freely Coasting Model?)
Garth
An old quasar in a young dark energy-dominated universe?
Perhaps the universe is older than it is normally thought to be?It is shown that for the currently accepted value of the matter density parameter, most of the existing dark energy scenarios cannot accommodate this old high redshift object unless the Hubble parameter is as low as Ho = 58km.s-1.Mpc-1, as recently advocated by Sandage and collaborators. Even considering less stringent age limits, only cosmological models that predicts a considerably old Universe at high z can be compatible with the existence of this object. This is the case of the conventional LambdaCDM scenario and some specific classes of brane world cosmologies.
(for example: Freely Coasting Model?)
Garth
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