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Title: Drifting oscillations in axion monodromy

Abstract

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.

Authors:
 [1];  [2];  [3];  [4]
  1. Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213 (United States)
  2. Department of Physics, Cornell University, Ithaca, NY 14853 (United States)
  3. Stanford Institute for Theoretical Physics, Stanford University, Stanford, CA 94305 (United States)
  4. Theory Group, Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg (Germany)
Publication Date:
OSTI Identifier:
22667613
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2017; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCOUNTING; ACCURACY; AMPLITUDES; AXIONS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; ENERGY DENSITY; EXPECTATION VALUE; FIELD THEORIES; INFLATIONARY UNIVERSE; MODULATION; OSCILLATIONS; SPACE; SPECTRA; SYMMETRY

Citation Formats

Flauger, Raphael, McAllister, Liam, Silverstein, Eva, and Westphal, Alexander. Drifting oscillations in axion monodromy. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/10/055.
Flauger, Raphael, McAllister, Liam, Silverstein, Eva, & Westphal, Alexander. Drifting oscillations in axion monodromy. United States. doi:10.1088/1475-7516/2017/10/055.
Flauger, Raphael, McAllister, Liam, Silverstein, Eva, and Westphal, Alexander. Sun . "Drifting oscillations in axion monodromy". United States. doi:10.1088/1475-7516/2017/10/055.
@article{osti_22667613,
title = {Drifting oscillations in axion monodromy},
author = {Flauger, Raphael and McAllister, Liam and Silverstein, Eva and Westphal, Alexander},
abstractNote = {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.},
doi = {10.1088/1475-7516/2017/10/055},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2017,
place = {United States},
year = {2017},
month = {10}
}

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