Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-12-29
Phys.Rev.D81:064029,2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
23 pages, 2 figures, references on oscillons added, version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.81.064029
Spherically symmetric oscillatons (also referred to as oscillating soliton stars) i.e. gravitationally bound oscillating scalar lumps are considered in theories containing a massive self-interacting real scalar field coupled to Einstein's gravity in 1+D dimensional spacetimes. Oscillations are known to decay by emitting scalar radiation with a characteristic time scale which is, however, extremely long, it can be comparable even to the lifetime of our universe. In the limit when the central density (or amplitude) of the oscillaton tends to zero (small-amplitude limit) a method is introduced to compute the transcendentally small amplitude of the outgoing waves. The results are illustrated in detail on the simplest case, a single massive free scalar field coupled to gravity.
Fodor Gyula
Forgacs Peter
Mezei Márk
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