Axions/Axion like particles and the CMB asymmetric dipole

Abstract

Axions and axion like particles are very attractive dark matter candidates. In this review, we briefly investigate how the cosmological observations reveal the existence of dark matter and some unique properties of axions/axion like particles which make them more interesting.

Comments: 9 pages, a contribution to the special issue "Composite dark matter" in the International Journal of Modern Physics D