Relaxing the cosmological moduli problem by low-scale inflation

Relaxing the cosmological moduli problem by low-scale inflation
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通过小规模暴胀缓解宇宙模量问题

DOI:
10.1007/jhep04(2019)149
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发表时间:
2019
影响因子:
5.4
通讯作者:
W. Yin
W. Yin
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shu;F. Takahashi;W. Yin

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我们表明,宇宙学丰富的弦轴子是远远小于天真的估计,如果哈勃尺度的通货膨胀,H inf,是足够低(但仍然可以远远高于轴子质量),如果通货膨胀持续足够长的时间。这是因为弦轴子的初始失准角服从Bunch-Davies分布,在势能最小值处达到峰值。因此,由弦轴子引起的宇宙学模量问题可以通过低尺度暴胀而得到显著放松,并且在很宽的质量范围内满足天体物理和宇宙学界限,而无需对初始失准角进行任何微调。具体地说,衰变常数f = 10 16 GeV的轴子满足H inf 10 keV-10 6 GeV的10− 18 eV m 10 TeV的边界。我们还讨论了多个轴子和QCD轴子的情况。
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
规范介导的 SUSY 断裂模型中的模量问题和重子发生
DOI: --
发表时间: 2002
期刊: Physical Review D 65
影响因子: --
作者:
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通讯作者: F.Takahashi