BROWSE

Related Scientist

Researcher

배규정
순수물리이론 연구단
more info

Deformation of axion potentials: Implications for spontaneous baryogenesis, dark matter, and isocurvature perturbations

Cited 0 time in webofscience Cited 0 time in scopus
12 Viewed 1 Downloaded
Title
Deformation of axion potentials: Implications for spontaneous baryogenesis, dark matter, and isocurvature perturbations
Author(s)
Kyu Jung Bae; Jeff Kost; Chang Sub Shin
Publication Date
2019-02
Journal
PHYSICAL REVIEW D, v.99, no.4, pp.043502 -
Publisher
AMER PHYSICAL SOC
Abstract
© 2019 authors. Published by the American Physical Society.We show that both the baryon asymmetry of the universe and dark matter (DM) can be accounted for by the dynamics of a single axionlike field. In this scenario, the observed baryon asymmetry is produced through spontaneous baryogenesis - driven by the early evolution of the axion - while its late-time coherent oscillations explain the observed DM abundance. Typically, spontaneous baryogenesis via axions is only successful in regions of parameter space where the axion is relatively heavy, rendering it highly unstable and unfit as a dark matter candidate. However, we show that a field-dependent wave function renormalization can arise which effectively deforms the axion potential, allowing for efficient generation of baryon asymmetry while maintaining a light and stable axion. Meanwhile, such deformations of the potential induce nontrivial axion dynamics, including a tracking behavior during its intermediate phase of evolution. This attractorlike dynamics dramatically reduces the sensitivity of the axion relic abundance to initial conditions and naturally suppresses DM isocurvature perturbations. Finally, we construct an explicit model realization, using a continuum-clockwork axion, and survey the details of its phenomenological viability. © 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3
URI
https://pr.ibs.re.kr/handle/8788114/6484
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
Files in This Item:
PhysRevD.99.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse