Abstract
Abstract We propose a model in which ultra high energy cosmic rays and gammaray bursts are produced by collisions between neutron stars and axionstars. The acceleration of such a cosmic ray is made by the electric field,∼ 10 15 (B/10 12 G) eV cm −1 , which is induced in an axion star by relativelystrong magnetic field B > 10 12 G of a neutron star. On the other hand,similar collisions generate gamma ray bursts when magnetic field is relativelysmall, e.g. ≤ 10 10 G. Assuming that the axion mass is ∼ 10 −9 eV, we canexplain huge energies of the gamma ray bursts ∼ 10 54 erg as well as the ul-tra high energies of the cosmic rays ∼ 10 20 eV. We estimate rate of energyrelease in the collisions and we find that the rate roughly agrees with obser-vations. In addition, we show that these axion stars are plausible candidatesfor MACHOs. Since the axion star induces oscillating electric current underthe magnetic field, observable monochromatic radiations are emitted.14.80.Mz, 95.30.+d, 98.80.Cq, 98.70.Rz, 97.60.Jd, 05.30.Jp, 98.70.Sa,11.27.+d
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