Axion Kinetic Misalignment Mechanism

Raymond T. Co; Lawrence J. Hall; Keisuke Harigaya

doi:10.1103/PhysRevLett.124.251802

Axion Kinetic Misalignment Mechanism

Raymond T. Co, Lawrence J. Hall, Keisuke Harigaya

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

141 Scopus citations

Abstract

In the conventional misalignment mechanism, the axion field has a constant initial field value in the early Universe and later begins to oscillate. We present an alternative scenario where the axion field has a nonzero initial velocity, allowing an axion decay constant much below the conventional prediction from axion dark matter. This axion velocity can be generated from explicit breaking of the axion shift symmetry in the early Universe, which may occur as this symmetry is approximate.

Original language	English (US)
Article number	251802
Journal	Physical review letters
Volume	124
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.124.251802
State	Published - Jun 26 2020

Bibliographical note

Funding Information:
The work was supported in part by the DOE Early Career Grant DE-SC0019225 (R. C.), the DOE Grants No. DE-AC02-05CH11231 (L. H.) and No. DE-SC0009988 (K. H.), the NSF Grant No. NSF-1638509 (L. H.), as well as the Raymond and Beverly Sackler Foundation Fund (K. H.).

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© 2020 authors. Published by the American Physical Society.

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Axion Kinetic Misalignment Mechanism

Abstract

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