Axion quality problem alleviated by nonminimal coupling to gravity
Axion quality problem alleviated by nonminimal coupling to gravity
复制标题
通过与重力的非最小耦合缓解轴子质量问题
DOI:
10.1103/physrevd.105.076008
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发表时间:
2022
影响因子:
5
通讯作者:
Nagata Natsumi
中科院分区:
文献类型:
--
作者:
Hamaguchi Koichi;Kanazawa Yoshiki;Nagata Natsumi
Global symmetries are expected to be violated by gravity, which may cause a serious problem to models based on these symmetries. A famous example is the Peccei-Quinn solution to the strongproblem in QCD axion models; it requires a global U(1) symmetry to be respected with high quality, and even the Planck-scale suppressed operators that violate the U(1) symmetry would spoil this solution. Indeed, it is known that gravitational instantons do break the U(1) Peccei-Quinn symmetry and induce the U(1)-violating operators, bringing back the strongproblem to the axion models. This conclusion is, however, highly dependent on the structure of the theory around the Planck scale and, therefore, may be evaded if we go beyond the minimal setup. In this paper, we study the effect of a nonminimal coupling of the Peccei-Quinn field to gravity,, on the gravitational instanton effect. This setup is frequently considered in cosmology as it can realize a successful inflation if. We find that the U(1)-breaking effect of the gravitational instantons can sufficiently be suppressed for, which suggests that the U(1) symmetry may be maintained with high quality even in the presence of gravity. Our result thus points to a new way to avoid the quality problem of global symmetries.
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影响因子:
3.5
作者:
D. H. Coule
通讯作者:
D. H. Coule
影响因子:
4.4
作者:
Y. Nakai;Motoo Suzuki
通讯作者:
Motoo Suzuki
影响因子:
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作者:
G. Ballesteros;A. Ringwald;C. Tamarit;Y. Welling
通讯作者:
Y. Welling
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
Yiran Li;N. Zhu;Shilei Lv
通讯作者:
Shilei Lv
影响因子:
4.4
作者:
S. Dimopoulos
通讯作者:
S. Dimopoulos