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Title: Axion misalignment driven to the hilltop

Abstract

The QCD axion serves as a well-motivated dark matter candidate and the misalignment mechanism is known to reproduce the observed abundance with a decay constant $$f_a \simeq \mathcal{O}(10^{12})$$ GeV for a misalignment angle $$\theta_{\rm mis} \simeq \mathcal{O}(1)$$. While $$f_a \ll 10^{12}$$ GeV is of great experimental interest, the misalignment mechanism requires the axion to be very close to the hilltop, i.e. $$\theta_{\rm mis} \simeq \pi$$. This particular choice of $$\theta_{\rm mis}$$ has been understood as fine-tuning the initial condition. We offer a dynamical explanation for $$\theta_{\rm mis} \simeq \pi$$ in a class of models. The axion dynamically relaxes to the minimum of the potential by virtue of an enhanced mass in the early universe. This minimum is subsequently converted to a hilltop because the CP phase of the theory shifts by $$\pi$$ when one contribution becomes subdominant to another with an opposite sign. We demonstrate explicit and viable examples in supersymmetric models where the higher dimensional Higgs coupling with the inflaton naturally achieves both criteria. Associated phenomenology includes a strikingly sharp prediction of $$3 \times 10^9$$ GeV $$\lesssim f_a \lesssim 10^{10}$$ GeV and the absence of isocurvature perturbation.

Authors:
 [1]; ORCiD logo [1];  [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Leinweber Center for Theoretical Physics
  2. Inst. for Advanced Study, Princeton, NJ (United States)
Publication Date:
Research Org.:
Inst. for Advanced Study, Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1596295
Grant/Contract Number:  
[SC0009988; SC0019225]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
[Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2019; Journal Issue: 5]; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Cosmology of Theories beyond the SM; Confi nement; Supersymmetric Gauge Theory; Supersymmetric Standard Model

Citation Formats

Co, Raymond T., Gonzalez, Eric, and Harigaya, Keisuke. Axion misalignment driven to the hilltop. United States: N. p., 2019. Web. doi:10.1007/JHEP05(2019)163.
Co, Raymond T., Gonzalez, Eric, & Harigaya, Keisuke. Axion misalignment driven to the hilltop. United States. doi:10.1007/JHEP05(2019)163.
Co, Raymond T., Gonzalez, Eric, and Harigaya, Keisuke. Mon . "Axion misalignment driven to the hilltop". United States. doi:10.1007/JHEP05(2019)163. https://www.osti.gov/servlets/purl/1596295.
@article{osti_1596295,
title = {Axion misalignment driven to the hilltop},
author = {Co, Raymond T. and Gonzalez, Eric and Harigaya, Keisuke},
abstractNote = {The QCD axion serves as a well-motivated dark matter candidate and the misalignment mechanism is known to reproduce the observed abundance with a decay constant $f_a \simeq \mathcal{O}(10^{12})$ GeV for a misalignment angle $\theta_{\rm mis} \simeq \mathcal{O}(1)$. While $f_a \ll 10^{12}$ GeV is of great experimental interest, the misalignment mechanism requires the axion to be very close to the hilltop, i.e. $\theta_{\rm mis} \simeq \pi$. This particular choice of $\theta_{\rm mis}$ has been understood as fine-tuning the initial condition. We offer a dynamical explanation for $\theta_{\rm mis} \simeq \pi$ in a class of models. The axion dynamically relaxes to the minimum of the potential by virtue of an enhanced mass in the early universe. This minimum is subsequently converted to a hilltop because the CP phase of the theory shifts by $\pi$ when one contribution becomes subdominant to another with an opposite sign. We demonstrate explicit and viable examples in supersymmetric models where the higher dimensional Higgs coupling with the inflaton naturally achieves both criteria. Associated phenomenology includes a strikingly sharp prediction of $3 \times 10^9$ GeV $\lesssim f_a \lesssim 10^{10}$ GeV and the absence of isocurvature perturbation.},
doi = {10.1007/JHEP05(2019)163},
journal = {Journal of High Energy Physics (Online)},
number = [5],
volume = [2019],
place = {United States},
year = {2019},
month = {5}
}

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