Wednesday, December 12, 2012

1212.2254 (J. Barranco et al.)

Can the dark matter halo be a collisionless ensemble of axion stars?    [PDF]

J. Barranco, A. Carrillo Monteverde, D. Delepine
If dark matter is mainly composed of axions, the density distribution can be non uniform distributed but clumpy instead. By solving the Einstein-Klein Gordon system of a scalar field with a potential energy density of an axion like particle, we obtain the maximum mass of the self gravitating system made of axions called axion stars. The collision of axion stars with neutron stars may release the energy of axions due to the conversion of axions into photons in the presence of the neutron star magnetic field. We estimate the energy release and shown that it may exceed the solar luminosity per collision but should be much less than previous estimates. Future data from femtolensing should strongly constrain this scenario.
View original: http://arxiv.org/abs/1212.2254

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