1993/11/15 by Edward W. Kolb, Igor I. Tkachev · 1 citation
Physics and Astronomy · #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevd.49.5040
published as Phys.Rev.D49:5040-5051,1994 · 27 pages plus 13 figures (upon request: [email protected]), LaTeX, FNAL--PUB--93/335--A
arxiv created 1993/11/15 · arxiv updated 2011/07/19
The (3+1)-dimensional evolution of an inhomogeneous axion field configuration around the QCD epoch is studied numerically, including important non-linear effects due to the attractive self-interaction. It is found that axion perturbations on scales corresponding to causally disconnected regions at T ∼ 1 \rm GeV can lead to very dense pseudo-soliton configurations we call axitons. These configurations evolve to axion miniclusters with present density ρa \ga 10-8 \rm g cm-3. This is high enough for the collisional 2a → 2a process to lead to Bose--Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars.