Compactifying the state space for alternative theories of gravity

Details Compactifying the state space for alternative theories of gravity Compactifying the state space for alternative theories of gravity

2007-10-03

arxiv.org/abs/0710.0819v2

Class.Quant.Grav.25:035013,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18 pages, revised to match published version

Scientific paper

10.1088/0264-9381/25/3/035013

In this paper we address important issues surrounding the choice of variables when performing a dynamical systems analysis of alternative theories of gravity. We discuss the advantages and disadvantages of compactifying the state space, and illustrate this using two examples. We first show how to define a compact state space for the class of LRS Bianchi type I models in $R^n$-gravity and compare to a non--compact expansion--normalised approach. In the second example we consider the flat Friedmann matter subspace of the previous example, and compare the compact analysis to studies where non-compact non--expansion--normalised variables were used. In both examples we comment on the existence of bouncing or recollapsing orbits as well as the existence of static models.

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