Axion stars and fast radio bursts

We show a possible origin of fast radio bursts. They arise from the collisions between axion stars and neutron stars. The bursts are emitted in atmospheres of the neutron stars. The observed frequencies of the bursts are given by the axion mass m(a) such as m(a)/2 pi similar or equal to 2.4 GHz(m(a)/10(-5) eV). By the comparison of the theoretical with observed event rate similar to 10(-3) per year in a galaxy, we can determine the mass similar to 10(-12)M(circle dot) of the axion stars. The mass is identical to the one estimated as the masses of axion miniclusters. Using these values, we can explain short durations (similar to ms) and amount of radiation energies (similar to 10(43) GeV) of the bursts.