Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-11-19
Class.Quant.Grav.28:085011,2011
Physics
High Energy Physics
High Energy Physics - Theory
14 pages, 8 figures
Scientific paper
10.1088/0264-9381/28/8/085011
The occurrence of a bounce in FRW cosmology requires modifications of general relativity. An example of such a modification is the recently proposed Horava-Lifshitz theory of gravity, which includes a ``dark radiation'' term with a negative coefficient in the analog of the Friedmann equation. This paper describes a phase space analysis of models of this sort with the aim of determining to what extent bouncing solutions can occur. A simplification, valid in the relevant region, allows a reduction of the dimension of phase space so that visualization in three dimensions is possible. It is found that a bounce is possible, but not generic in models under consideration. Apart from previously known bouncing solutions some new ones are also described. Other interesting solutions found include ones which describe a novel sort of oscillating universes.
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