by The IAXO collaboration, together with some collaborators from the axion phenomenology community has just released a preprint with a comprehensive review of the physics case of IAXO:
http://inspirehep.net/record/1730453
IAXO has the potential to find the QCD axion in the 1 meV to 1 eV mass range where it solves the strong CP problem, can account for the cold dark matter of the Universe and be responsible for the anomalous cooling observed in a number of stellar systems. At the same time, IAXO will have enough sensitivity to detect lower mass axions invoked to explain: 1) the origin of the anomalous “transparency” of the Universe to gamma-rays, 2) the observed soft X-ray excess from galaxy clusters or 3) some inflationary models. In addition, the paper reviews string theory axions with parameters accessible by IAXO and discuss their potential role in cosmology as Dark Matter and Dark Radiation as well as their connections to the above mentioned conundrums.
