TY - JOUR
T1 - Tensor spectra templates for axion-gauge fields dynamics during inflation
AU - Fujita, Tomohiro
AU - Sfakianakis, Evangelos I.
AU - Shiraishi, Maresuke
N1 - Publisher Copyright:
© 2019 IOP Publishing Ltd and Sissa Medialab.
PY - 2019/4/30
Y1 - 2019/4/30
N2 - SU(2) gauge fields can generate large gravitational waves during inflation, if they are coupled to an axion which can be either the inflaton or a spectator field. The shape of the produced tensor power spectrum h depends on the form of the axion potential. We derive analytic expressions and provide general templates for h for various types of the spectator axion potential. Furthermore, we explore the detectability of the oscillatory feature, which is present in h in the case of an axion monodromy model, by possible future CMB B-mode polarization observations.
AB - SU(2) gauge fields can generate large gravitational waves during inflation, if they are coupled to an axion which can be either the inflaton or a spectator field. The shape of the produced tensor power spectrum h depends on the form of the axion potential. We derive analytic expressions and provide general templates for h for various types of the spectator axion potential. Furthermore, we explore the detectability of the oscillatory feature, which is present in h in the case of an axion monodromy model, by possible future CMB B-mode polarization observations.
KW - CMBR polarisation
KW - ination
KW - primordial gravitational waves (theory)
UR - http://www.scopus.com/inward/record.url?scp=85069632148&partnerID=8YFLogxK
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U2 - 10.1088/1475-7516/2019/05/057
DO - 10.1088/1475-7516/2019/05/057
M3 - Article
AN - SCOPUS:85069632148
SN - 1475-7516
VL - 2019
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 5
M1 - 057
ER -