TY - JOUR
T1 - Cosmological constraints on axionic dark radiation from axion-photon conversion in the early Universe
AU - Higaki, Tetsutaro
AU - Nakayama, Kazunori
AU - Takahashi, Fuminobu
PY - 2013/9
Y1 - 2013/9
N2 - Axions seem ubiquitous in string theories and some of them may be produced non-thermally by heavy scalar decays, contributing to dark radiation. We study various cosmological effects of photons produced from the axionic dark radiation through axion-photon conversion in the presence of primordial magnetic fields, and derive tight constraints on the combination of the axion-photon coupling and the primordial magnetic field.
AB - Axions seem ubiquitous in string theories and some of them may be produced non-thermally by heavy scalar decays, contributing to dark radiation. We study various cosmological effects of photons produced from the axionic dark radiation through axion-photon conversion in the presence of primordial magnetic fields, and derive tight constraints on the combination of the axion-photon coupling and the primordial magnetic field.
KW - axions
KW - particle physics - cosmology connection
KW - physics of the early universe
UR - http://www.scopus.com/inward/record.url?scp=84884829789&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84884829789&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2013/09/030
DO - 10.1088/1475-7516/2013/09/030
M3 - Article
AN - SCOPUS:84884829789
SN - 1475-7516
VL - 2013
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 9
M1 - 030
ER -