Axions : Theory

Axion Theory.- The Strong CP Problem and Axions.- Axion Cosmology.- Astrophysical Axion Bounds.- Axions and Large Extra Dimensions.- Axions and Their Relatives.- Observations and Experiments.- Magnetic and Electric Dipole Moments in Storage Rings.- Photon-Axion Conversion in Intergalactic Magnetic Fields and Cosmological Consequences.- Microwave Cavity Searches.- Recent Results from the PVLAS Experiment on the Magnetized Vacuum.- Axion Searches in the Past, at Present, and in the Near Future.