1. Primordial nucleosynthesis, Cosmic Microwave background and baryon
density. Dark baryons. [1]

2. The strong CP problem. The Peccei-Quinn symmetry and axions. Axion
properties. Laboratory, astrophysical and cosmological axions. [2]


Bibliography:

Gary Steigman , Primordial Nucleosynthesis in the Precision Cosmology Era,
astro-ph/0712.1100

Roberto Peccei, Strong CP Problem and Axions, hep-ph/0607268

Georg Raffelt, Astrophysical Axion Bounds, hep-ph/0611350

Pierre Sikivie, Axion Cosmology, astro-ph/0610440

Eduard Masso, Axions and their Relatives, hep-ph/0607215