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Georg Raffelt, Max-Planck-Institut für Physik, München, Germany<br />
The Pool Table Analogy<br />
PONT d‘Avignon, 21-25 April 2008, Avignon, France<br />
P.Sikivie<br />
Sikivie, , Physics Today, Dec. 1996, pg. 22<br />
Gravity<br />
Pool table<br />
Axis<br />
Symmetric<br />
relative<br />
to gravity<br />
Floor<br />
inclined<br />
Symmetry<br />
broken<br />
New degree<br />
of freedom<br />
<strong>Axion</strong><br />
Θ _<br />
(Weinberg 1978, Wilczek 1978)<br />
f a<br />
Symmetry<br />
dynamically<br />
restored<br />
(Peccei & Quinn 1977)
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