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Georg Raffelt, Max-Planck-Institut für Physik, München, Germany<br />
<strong>Axion</strong> Mini Clusters<br />
PONT d‘Avignon, 21-25 April 2008, Avignon, France<br />
The inhomogeneities of the axion field are large, leading to bound objects,<br />
“axion mini clusters”. . [Hogan & Rees, PLB 205 (1988) 228.]<br />
Self-coupling of axion field crucial for dynamics.<br />
Typical mini cluster properties:<br />
Mass ~ 10 −12<br />
M sun<br />
Radius ~ 10 10 cm<br />
Mass fraction up to several 10%<br />
Potentially detectable with<br />
gravitational femtolensing<br />
Distribution of axion energy density.<br />
2-dim slice of comoving length 0.25 pc<br />
[Kolb & Tkachev, ApJ 460 (1996) L25]
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