Relaxing the cosmological moduli problem by low-scale inflation
Relaxing the cosmological moduli problem by low-scale inflation
复制标题
通过小规模暴胀缓解宇宙模量问题
DOI:
10.1007/jhep04(2019)149
复制
发表时间:
2019
影响因子:
5.4
通讯作者:
W. Yin
中科院分区:
文献类型:
--
作者:
Shu;F. Takahashi;W. Yin
We show that the cosmological abundance of string axions is much smaller than naive estimates if the Hubble scale of inflation, H inf, is sufficiently low (but can still be much higher than the axion masses) and if the inflation lasts sufficiently long. The reason is that the initial misalignment angles of the string axions follow the Bunch-Davies distribution peaked at the potential minima. As a result, the cosmological moduli problem induced by the string axions can be significantly relaxed by low-scale inflation, and astrophysical and cosmological bounds are satisfied over a wide range of the mass without any fine-tuning of the initial misalignment angles. Specifically, the axion with its decay constant f ϕ= 10 16 GeV satisfies the bounds over 10− 18 eV≲ m ϕ≲ 10 TeV for H inf≲ 10 keV-10 6 GeV. We also discuss cases with multiple axions and the QCD axion.
DOI:
10.1103/physrevd.53.1784
发表时间:
1995-10
期刊:
Physical review. D, Particles and fields
影响因子:
--
作者:
D. Lyth;E. Stewart
通讯作者:
D. Lyth;E. Stewart
DOI:
--
发表时间:
2002
期刊:
Physical Review D 65
影响因子:
--
作者:
S.Kasuya;M.Kawasaki;F.Takahashi
通讯作者:
F.Takahashi