Abstract: In general relativity a single massive real scalar field can form long living stable oscillating localized configurations, which are generally called oscillatons. These objects are quite similar to the well known boson stars. However, in case of oscillatons the metric is not stationary, and there is a tiny outgoing scalar field radiation, so the mass is decreasing very slowly. In my talk I plan to describe the main properties of the one-parameter family oscillaton configurations, which we have studied by high order perturbational and direct numerical methods. I would like to present the calculation of the mass-loss rate, which turns out to be exponentially small in terms of the central amplitude of the oscillaton. I also plan to discuss how the situation changes when the cosmological constant is nonzero.
Gyula Fodor (Paris Observatory)
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This seminar is supported by Portuguese Funds through the CIDMA - Centre for Research and Development in Mathematics and Applications, and the Portuguese Foundation for Science and Technology ("FCT" - Fundação para a Ciência e a Tecnologia), within the project UID/MAT/04106/2013.
