Radiations from Oscillating Axionic Boson Stars in an External Magnetic Field
Abstract
We solve numerically a field equation of axions coupled with gravity and show solutions representing oscillating axionic boson stars with small mass 10-12M and large radius 108 cm. We present explicitly a relation between the mass and the radius of the boson stars with such a small mass. These axionic boson stars are shown to possess oscillating electric currents in an external magnetic field and to radiate electromagnetic fields with a frequency given by mass of the axions. We estimate the luminosity of the radiation in a strong magnetic field 1012G of neutron stars, typically 1024 erg/s with the axion mass being 10-5eV.
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