Non-Linear Axion Dynamics and Formation of Cosmological Pseudo-Solitons

Abstract

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 $T\sim 1\mathrm{GeV}$ can lead to very dense pseudo-soliton configurations we call axitons. These configurations evolve to axion miniclusters with present density $ρ_a \ga 10^{-8}\,{\rm g \, cm^{-3}}$. This is high enough for the collisional $2a\to 2a$ process to lead to Bose--Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars.

27 pages plus 13 figures (upon request: [email protected]), LaTeX, FNAL--PUB--93/335--A

References in corpus (3)

• Planck-Scale Physics and the Peccei-Quinn Mechanism
• Solutions to the strong CP problem in a world with gravity
• Axion Miniclusters and Bose Stars

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