Forming Seed Galaxies in a Bouncing Universe

[wolram]

There is a problem in cosmology, no one knows how the first stars were formed, so i thought maybe;

seed galaxies could be formed from inhomogeneites in a bouncing universe, where deconstruction of the first universe was not complete?

Is this possible or do you need complete annihilation of the first universe for a bounce to happen
.

 

[mathman]

There is a problem in cosmology, no one knows how the first stars were formed

Where did you get this idea?

http://www.scientificamerican.com/article/the-first-stars-in-the-un/
http://www.astro.yale.edu/larson/papers/SciAm04.pdf

Above are papers on the subject.

 

[wolram]

Se thread

https://www.physicsforums.com/showthread.php?t=771646

 

[wolram]

I am sorry i said stars, i should have said galaxies.

 

[ChrisVer]

In this thread
https://www.physicsforums.com/threads/start-of-expansion-of-universe.771214/
I wrote at some point that bounce universe models are somewhat ruled out [at least that's what I had read in bibliography - John A. Peacock-Cosmological Physics -Chapter 3 -bouncing and loitering models *] , and in addition to that there was also this post:

Bounce models are ruled out because the universe doesn't appear to be cyclic in this way since the expansion of the universe is accelerating, not slowing. It has nothing to do with "not liking them".

* QUOTING FROM BOOK

In fact, bounce models can be ruled out quite strongly. The same cubic equations that
define the critical conditions for a bounce also give an inequality for the maximum
redshift possible (that of the bounce):
1+ z_B \le 2 f( \frac{1}{3} f^{-1}(Ω_m^{-1}-1))
A reasonable lower limit for Ω_m of 0.1 then rules out a bounce once objects are seen at z>2

Also in the diagram given in the same section, the no big-bang solutions need a large value for the vacuum energy (\Omega_\Lambda>1, whereas \Omega_{\Lambda}^{(exp)}=0.692 \pm 0.010 http://en.wikipedia.org/wiki/Cosmological_constant#.CE.A9.CE.9B_.28Omega_Lambda.29)