Axion misalignment driven to the hilltop
Axion misalignment driven to the hilltop
复制标题
轴子错位驱动至山顶
DOI:
10.1007/jhep05(2019)163
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发表时间:
2018
影响因子:
5.4
通讯作者:
K. Harigaya
中科院分区:
文献类型:
--
作者:
R. Co;Eric Gonzalez;K. Harigaya
A bstractThe 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 fa ≃ O$$ \mathcal{O} $$(1012) GeV for a misalignment angle θmis ≃ O$$ \mathcal{O} $$(1). While fa ≪ 1012 GeV is of great experimental interest, the misalignment mechanism requires the axion to be very close to the hilltop, i.e. θmis ≃ π. This particular choice of θmis has been understood as fine-tuning the initial condition. We offer a dynamical explanation for θmis ≃ π 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 π 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 × 109 GeV ≲ fa ≲ 1010 GeV and the absence of isocurvature perturbation.
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影响因子:
4.4
作者:
Harigaya, Keisuke;Kawasaki, Masahiro
通讯作者:
Kawasaki, Masahiro
影响因子:
64.8
作者:
Andreev, V.;Ang, D. G.;Wu, X.
通讯作者:
Wu, X.
影响因子:
64.8
作者:
Borsanyi, S.;Fodor, Z.;Szabo, K. K.
通讯作者:
Szabo, K. K.
影响因子:
8.6
作者:
Caldwell, Allen;Dvali, Gia;Steffen, Frank
通讯作者:
Steffen, Frank