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Relativistic axions from collapsing Bose stars · Around

2016

Relativistic axions from collapsing Bose stars

Levkov, D. G., Panin, A. G., Tkachev, I. I.

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The substructures of light bosonic (axion-like) dark matter may condense into compact Bose stars.

We study collapses of the critical-mass stars caused by attractive self-interaction of the axion-like particles and find that these processes proceed in an unexpected universal way.
First, nonlinear self-similar evolution (called "wave collapse" in condensed matter physics) forces the particles to fall into the star center.
Second, interactions in the dense center create an outgoing stream of mildly relativistic particles which carries away an essential part of the star mass.

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We use nonuniform lattice with adaptive refinement, Kreiss-Oliger dissipation, the second-order iterated Crank-Nicholson integrator for the nonrelativistic evolution and the sixth-order Runge-Kutta method for the relativistic one. These advanced numerical techniques are targeted at achieving record precision of the numerical solution which starts from 10 − 10 10^{-10} in the beginning of the collapse and degrades to 10 − 2 10^{-2} at m t ∼ 10 4 mt\sim 10^{4}

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