1993/03/29 by Edward W. Kolb, Igor I. Tkachev · 2 citations
Physics and Astronomy · #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1103/physrevlett.71.3051
published as Phys.Rev.Lett. 71 (1993) 3051-3054 · 12 pages plus 3 eps figures (available via e-mail: [email protected]), LaTeX, FERMILAB--PUB--93/066-A
arxiv created 1993/03/29 · arxiv updated 2009/11/30
Evolution of inhomogeneities in the axion field around the QCD epoch is studied numerically, including for the first time important non-linear effects. It is found that perturbations on scales corresponding to causally disconnected regions at T ∼ 1 \rm GeV can lead to very dense axion clumps, 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.