TY  - JOUR
AU  - Flauger, Raphael
AU  - McAllister, Liam
AU  - Silverstein, Eva
AU  - Westphal, Alexander
TI  - Drifting oscillations in axion monodromy
JO  - Journal of cosmology and astroparticle physics
VL  - 1710
IS  - 10
SN  - 1475-7516
CY  - London
PB  - IOP
M1  - PUBDB-2017-13763
M1  - SU/ITP-14/29
M1  - SLAC-PUB-16165
M1  - DESY-14-225
M1  - arXiv:1412.1814
SP  - 055
PY  - 2017
N1  - (c) IOP Publishing Ltd and Sissa Medialab ; Post referee fulltext in progress; Embargo 12 months from publication
AB  - We study the pattern of oscillations in the primordial power spectrum in axion monodromy inflation, accounting for drifts in the oscillation period that can be important for comparing to cosmological data. In these models the potential energy has a monomial form over a super-Planckian field range, with superimposed modulations whose size is model-dependent. The amplitude and frequency of the modulations are set by the expectation values of moduli fields. We show that during the course of inflation, the diminishing energy density can induce slow adjustments of the moduli, changing the modulations. We provide templates capturing the effects of drifting moduli, as well as drifts arising in effective field theory models based on softly broken discrete shift symmetries, and we estimate the precision required to detect a drifting period. A non-drifting template suffices over a wide range of parameters, but for the highest frequencies of interest, or for sufficiently strong drift, it is necessary to include parameters characterizing the change in frequency over the e-folds visible in the CMB. We use these templates to perform a preliminary search for drifting oscillations in a part of the parameter space in the Planck nominal mission data.
LB  - PUB:(DE-HGF)29 ; PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000414180600003
DO  - DOI:10.1088/1475-7516/2017/10/055
UR  - https://bib-pubdb1.desy.de/record/398152
ER  -