G'day from the land of ozzzzz
We see by observations, matter going towards the cenre of a galaxy and we observe the ejection of matter via jets that are able to reform and feedack matter in the process of galactic evolution.
This paper is quite interesting along those lines.
[0906.1789] Non-singular cosmology in a model of non-relativistic gravity
Non-singular cosmology in a model of non-relativistic gravity
Authors: Yi-Fu Cai, Emmanuel N. Saridakis
(Submitted on 9 Jun 2009)
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Abstract: We present a model of non-relativistic gravitational theory which is power-counting renormalizable in 3+1 dimensional spacetime. When applied to cosmology, the relativity-violation terms lead to a dark radiation component, which can give rise to a bounce if dark radiation possesses negative energy density. Additionally, we investigate a cyclic extension of the non-singular cosmology in which the universe undergoes contractions and expansions periodically. In both scenarios the background theory is well defined at the quantum level.
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