C. Amsler Physik-Institut der Universität Zürich
C. Amsler Physik-Institut der Universität Zürich
C. Amsler Physik-Institut der Universität Zürich
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WIN’11, CapeTown, 31 January 2011, C. <strong>Amsler</strong><br />
II) Axions: a -> gg: Mean life ≫ age of universe for M < 10 eV<br />
M < 0.01 eV otherwise a -> gg enhances cooling in red giants<br />
M = 10-3 - 10-5 eV<br />
CAST expriment at CERN (axions from the sun) M < 0.02 eV<br />
g<br />
a<br />
g<br />
9T<br />
III) WIMPs: Weakly Interacting Massive Particles<br />
e.g. the neutralino x1 of predicted by supersymmetry<br />
excluded<br />
DM candidates, see e.g. RPP 2010, M. Drees and G. Gerbier<br />
I) Neutrinos (unlikely)<br />
Early universe: g e + e - nini until decoupling at T ≈ 1 MeV<br />
Critical density (V = 1 ) requires mne + mnm + mnt ≃ 50 eV but neutrinos are<br />
much lighter. Heavy neutrinos should decay<br />
< 45 GeV (LEP)<br />
M ≈ 100 GeV - a few TeV<br />
5
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