Light pseudoscalars, particle physics and cosmology

Kim J.E.

We review physics of light pseudoscalars (axions, majorons and famiions) and their effects in cosmology. The axions which solve the strong CP problem play important roles in astrophysics and cosmology. The allowed band of the axion scale may be the next high energy scale. We discuss the ideas, techniques and phenomenologies leading to this interesting mass scale. Majorons and famiions are also discussed.