High-scale axions without isocurvature from inflationary dynamics
Abstract
Observable primordial tensor modes in the cosmic microwave background (CMB) would point to a high scale of inflation HI. If the scale of Peccei-Quinn (PQ) breaking fa is greater than HI/2π, CMB constraints on isocurvature naively rule out QCD axion dark matter. This assumes the potential of the axion is unmodified during inflation. We revisit models where inflationary dynamics modify the axion potential and discuss how isocurvature bounds can be relaxed. We find that models that rely solely on a larger PQ-breaking scale during inflation fI require either late-time dilution of the axion abundance or highly super-Planckian fI that somehow does not dominate the inflationary energy density. Models that have enhanced explicit breaking of the PQ symmetry during inflation may allow fa close to the Planck scale. Lastly, avoiding disruption of inflationary dynamics provides important limits on the parameter space.
- Authors:
-
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1256325
- Alternate Identifier(s):
- OSTI ID: 1254888
- Report Number(s):
- FERMILAB-PUB-16-005-T; MCTP-16-02; arXiv:1601.03049
Journal ID: ISSN 2470-0010; PRVDAQ; 1415092; TRN: US1601745
- Grant/Contract Number:
- AC02-07CH11359; SC0007859
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 93; Journal Issue: 9; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Kearney, John, Orlofsky, Nicholas, and Pierce, Aaron. High-scale axions without isocurvature from inflationary dynamics. United States: N. p., 2016.
Web. doi:10.1103/PhysRevD.93.095026.
Kearney, John, Orlofsky, Nicholas, & Pierce, Aaron. High-scale axions without isocurvature from inflationary dynamics. United States. https://doi.org/10.1103/PhysRevD.93.095026
Kearney, John, Orlofsky, Nicholas, and Pierce, Aaron. Tue .
"High-scale axions without isocurvature from inflationary dynamics". United States. https://doi.org/10.1103/PhysRevD.93.095026. https://www.osti.gov/servlets/purl/1256325.
@article{osti_1256325,
title = {High-scale axions without isocurvature from inflationary dynamics},
author = {Kearney, John and Orlofsky, Nicholas and Pierce, Aaron},
abstractNote = {Observable primordial tensor modes in the cosmic microwave background (CMB) would point to a high scale of inflation HI. If the scale of Peccei-Quinn (PQ) breaking fa is greater than HI/2π, CMB constraints on isocurvature naively rule out QCD axion dark matter. This assumes the potential of the axion is unmodified during inflation. We revisit models where inflationary dynamics modify the axion potential and discuss how isocurvature bounds can be relaxed. We find that models that rely solely on a larger PQ-breaking scale during inflation fI require either late-time dilution of the axion abundance or highly super-Planckian fI that somehow does not dominate the inflationary energy density. Models that have enhanced explicit breaking of the PQ symmetry during inflation may allow fa close to the Planck scale. Lastly, avoiding disruption of inflationary dynamics provides important limits on the parameter space.},
doi = {10.1103/PhysRevD.93.095026},
journal = {Physical Review D},
number = 9,
volume = 93,
place = {United States},
year = {2016},
month = {5}
}
Web of Science
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