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arxiv: gr-qc/0508039 · v2 · submitted 2005-08-10 · 🌀 gr-qc · astro-ph

The Similarity Hypothesis in General Relativity

classification 🌀 gr-qc astro-ph
keywords modelsself-similarcasesgeneralhypothesisimportantrelativitysimilarity
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Self-similar models are important in general relativity and other fundamental theories. In this paper we shall discuss the ``similarity hypothesis'', which asserts that under a variety of physical circumstances solutions of these theories will naturally evolve to a self-similar form. We will find there is good evidence for this in the context of both spatially homogenous and inhomogeneous cosmological models, although in some cases the self-similar model is only an intermediate attractor. There are also a wide variety of situations, including critical pheneomena, in which spherically symmetric models tend towards self-similarity. However, this does not happen in all cases and it is it is important to understand the prerequisites for the conjecture.

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