Axion

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Georg Raffelt, Max-Planck-Institut für Physik, München, Germany Killing Two Birds with One Stone PONT d‘Avignon, 21-25 April 2008, Avignon, France Peccei-Quinn mechanism • Solves strong CP problem • May provide dark matter in the form of axions
Production of Cold <strong>Axion</strong> Population in the Early Universe Georg Raffelt, Max-Planck-Institut für Physik, München, Germany PONT d‘Avignon, 21-25 April 2008, Avignon, France Approximate axion cold dark matter density Ω a ≈ 7/6 ⎛ f 12 a ⎞ ⎛1μeV ⎞ 0.5 ⎜ ⎟ ≈ 4 ⎜ ⎟ ⎝ 10 GeV ⎠ ⎝ m a ⎠ 7/6 Inflation after PQ symmetry breaking Reheating restores PQ symmetry Homogeneous mode oscillates after T ≲ Λ QCD Dependence on initial misalignment angle Ω ∝ Θ a Θi • Cosmic strings of broken U PQ (1) form by Kibble mechanism • Radiate long-wavelength axions • Ω a independent of initial conditions • Isocurvature fluctuations from large quantum fluctuations of massless axion field created during inflation • Strong CMBR bounds on isocurvature fluctuations • Scale of inflation required to be very small Λ I ≲ 10 13 GeV [Beltrán, García-Bellido & Lesgourgues hep-ph/0606107] ph/0606107] Inhomogeneities of axion field large, self-couplings lead to formation of mini-clusters Typical properties • Mass ~ 10 −12 M sun • Radius ~ 10 10 cm • Mass fraction up to several 10%
Page 1 and 2: Georg G. Raffelt, Max-Planck Planck
Page 3 and 4: Georg Raffelt, Max-Planck-Institut
Page 5 and 6: Peccei-Quinn Mechanism Proposed in
Page 17 and 18: Supernova 1987A Energy-Loss Argumen
Page 19 and 20: Series of Papers on Axion Cosmology
Page 21: Series of Papers on Axion Cosmology
Page 27 and 28: Axion Hot Dark Matter from Thermali
Page 29 and 30: Axion Hot Dark Matter Limits from P
Page 31 and 32: Experimental Tests of the Invisible
Page 43 and 44: Results and Plans of Tokyo Axion He
Page 45 and 46: LHC Magnet Mounted as a Telescope t
Page 53 and 54: Dimming of Supernovae without Cosmi
Page 59: Technological Applications of PVLAS

Axion

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