TY  - EJOUR
AU  - Jeong, Kwangsik
AU  - Kawasaki, Masahiro
AU  - Takahashi, Fuminobu
TI  - Axions as Hot and Cold Dark Matter
IS  - DESY-13-181
M1  - DESY-2013-01123
M1  - DESY-13-181
M1  - arXiv:1310.1774
M1  - TU-948
M1  - ICRR-661-2013-10
M1  - IPMU13-0197
PY  - 2013
AB  - 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.
LB  - PUB:(DE-HGF)25 ; PUB:(DE-HGF)15
UR  - https://bib-pubdb1.desy.de/record/154830
ER  -