Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 23: Theoretische Astroteilchenphysik und Kosmologie I

T 23.7: Talk

Wednesday, March 17, 2010, 15:30–15:45, HG XV

Axions in the Early Universe — •Peter Graf and Frank Daniel Steffen — Max-Planck-Institut für Physik, München, Germany

The smallness of the CP violating term in the QCD Lagrangian is the well known strong CP problem. If it is solved via the Peccei-Quinn (PQ) mechanism, the pseudo-Nambu-Goldstone boson associated with the spontaneous breaking of the new chiral U(1)_PQ symmetry is the axion. We study the behavior of axions in the early Universe and calculate the temperature at which the axion decouples from the early QCD plasma.