Another age problem in the early universe?

1. Jan 3, 2016

Garth

I have on several occasions on PF flagged up examples where it appears that there is an age problem in the early universe, in other words highly evolved objects have been observed whose existences are difficult to explain at their high red shifts in the standard $\Lambda$CDM cosmological model.

Another example has been recently published in the Journal of the Korean Astronomical Society (48: 21-55, February 2015) and on the physics arXiv Massive Structures of Galaxies at High Redshifts in the Great Observatories Origins Deep Survey Fields
(emphasis mine)

Garth

Last edited: Jan 3, 2016
2. Jan 3, 2016

Chronos

Given the variance is sensitive to the assumptions employed in the Millenium simulation, this result is not altogether surprising. We already knew, for example, that the apparent mass of high z blackholes that power ancient quasars is a challenge to explain under LCDM, so it is reasonable to expect the answer to both enigmas is probably related.

Last edited: Jan 4, 2016
3. Jan 3, 2016

marcus

As they say in the conclusions of the article Garth quoted:
" By tweaking the conditions for the initial density fluctuation or baryonic physics in galaxy formation, one may be able to explain the result within the ΛCDM cosmology framework. ..."

It sounds like what we have here is a tweaking problem---adjusting the initial conditions of the standard cosmic model to get a better fit to all the data.