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Georg Raffelt, Max-Planck-Institut für Physik, München, Germany<br />
Windows of Opportunity<br />
PONT d‘Avignon, 21-25 April 2008, Avignon, France<br />
<strong>Axion</strong>s<br />
Solve strong CP problem<br />
by Peccei-Quinn<br />
dynamical symmetry restoration<br />
Alternatives<br />
• Massless up-quark<br />
• Spontaneous CP violation<br />
• Θ =<br />
0<br />
set at some high energy scale<br />
(no radiative corrections)<br />
• Supersymmetric particles<br />
• Superheavy particles<br />
• Cosmic cold dark matter candidate<br />
• Sterile Neutrinos<br />
• Direct detection possible<br />
• Many others …<br />
(but usually not experimentally<br />
accessible)<br />
Search for new physics at E ≫ TeV<br />
in low-energy experiments<br />
(<strong>Axion</strong>s Nambu-Goldstone boson of<br />
spontaneously broken symmetry)<br />
• Neutrino masses (see-saw)<br />
saw)<br />
• Proton decay<br />
• Neutron electric dipole moment<br />
• Deviation from Newton’s Law<br />
(e.g. large extra dimensions)
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