Self-Similar Scalar Field Collapse: Naked Singularities and Critical Behaviour

Abstract

Homothetic scalar field collapse is considered in this article. By making a suitable choice of variables the equations are reduced to an autonomous system. Then using a combination of numerical and analytic techniques it is shown that there are two classes of solutions. The first consists of solutions with a non-singular origin in which the scalar field collapses and disperses again. There is a singularity at one point of these solutions, however it is not visible to observers at finite radius. The second class of solutions includes both black holes and naked singularities with a critical evolution (which is neither) interpolating between these two extremes. The properties of these solutions are discussed in detail. The paper also contains some speculation about the significance of self-similarity in recent numerical studies.

27 pages including 5 encapsulated postcript figures in separate compressed file, report NCL94-TP12

References in corpus (3)

• Observation of critical phenomena and self-similarity in the gravitational collapse of radiation fluid
• Exact solution for scalar field collapse
• Discrete Self-Similiarity and Critical Point Behavior in Fluctuations About Extremal Black Holes

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