%0 Electronic Article
%A Jeong, Kwangsik
%A Kawasaki, Masahiro
%A Takahashi, Fuminobu
%T Axions as Hot and Cold Dark Matter
%N DESY-13-181
%M DESY-2013-01123
%M DESY-13-181
%M arXiv:1310.1774
%M TU-948
%M ICRR-661-2013-10
%M IPMU13-0197
%D 2013
%X The presence of a hot dark matter component has been hinted at 3 sigma by a combination of the results from different cosmological observations. We examine a possibility that pseudo Nambu-Goldstone bosons account for both hot and cold dark matter components. We show that the QCD axions can do the job for the axion decay constant f_a < O(10^10) GeV, if they are produced by the saxion decay and the domain wall annihilation. We also investigate the cases of thermal QCD axions, pseudo Nambu-Goldstone bosons coupled to the standard model sector through the Higgs portal, and axions produced by modulus decay.
%F PUB:(DE-HGF)25 ; PUB:(DE-HGF)15
%9 PreprintInternal Report
%U https://bib-pubdb1.desy.de/record/154830