Gravitational atoms: Gravitational radiation from excited boson stars

Details Gravitational atoms: Gravitational radiation from excited boson stars Gravitational atoms: Gravitational radiation from excited boson stars

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrvd..40.2524f&link_type=abstract

Physical Review D (Particles and Fields), Volume 40, Issue 8, 15 October 1989, pp.2524-2531

Physics

25

Scientific paper

Boson stars are gravitationally bound states of complex scalar fields. In general, as a solution of the Einstein-Klein-Gordon system, the scalar field can be expanded as a sum over modes given by the product of radial functions and spherical harmonics. We show that if the configuration is not in its ground state, the excited modes will decay to the ground state through emission of scalar and gravitational radiation. Using a Newtonian approximation, we obtain the power radiated in gravitational waves and the frequency of the gravitons emitted in the decay, in the case where most of the star is already in its ground state. The process is similar to the spontaneous emission of a photon in atoms, hence the name ``gravitational atoms.''

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