Abstract

• Attempts are made to give a brief description of axion dark matter and its possible root from CP problem in strong interaction. First of all, the theoretical background of symmetry and symmetry breaking in particle physics have been reviewed in detail . Then, the role of Goldstone‟s theorem, Goldstone‟s bosons in Gauge theories are investigated. It has been shown that spontaneous symmetry breaking of gauge symmetry can be described by Higgs mechanism. The most popular solution to the CP problem in strong interaction : the addition of an additional symmetric field and its quanta- axion is presented. A rough estimate of the axion mass is also conducted using currently available constraints on QCD and quantum cosmology.