Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-04-23
Phys.Lett. B451 (1999) 123-128
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 Pages Revtex
Scientific paper
10.1016/S0370-2693(99)00209-9
We solve numerically a field equation of axions coupled with gravity and show solutions representing oscillating axionic boson stars with small mass $\sim 10^{-12}M_{\odot}$ and large radius $\sim 10^{8}$ 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 $10^{12}$G of neutron stars, typically $\sim 10^{24}$ erg/s with the axion mass being $10^{-5}$eV.
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