Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-18
Prog.Theor.Phys. 101 (1999) 1253-1260
Physics
High Energy Physics
High Energy Physics - Phenomenology
Improved English
Scientific paper
10.1143/PTP.101.1253
Axions are possible candidates of dark matter in the present Universe. They have been argued to form axionic boson stars with small masses $\sim 10^{-12}M_{\odot}$. Since they possess oscillating electric fields in a magnetic field, they dissipate their energies in magnetized conducting media. We show that colliding with a magnetized white dwarf, the axionic boson stars dissipate their energies and heat the white dwarf. Consequently the white dwarf cooled sufficiently can emit detectable amount of radiations with the collision. Using a recent evaluation of the population of the white dwarfs as candidates of MACHOs, we estimate the event rate of the collisions and obtain a result that the rate is large to be detectable.
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