Inflation that runs naturally: Gravitational waves and suppression of power at large and small scales
Inflation that runs naturally: Gravitational waves and suppression of power at large and small scales
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DOI：
10.1103/physrevd.91.063504
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发表时间：
2014-11
影响因子：
5
通讯作者：
Q. Minor;M. Kaplinghat
中科院分区：
文献类型：
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作者：
Q. Minor;M. Kaplinghat
作者：Minor，QE; Kaplinghat，M|摘要：© 2015美国物理学会。我们指出了轴子单值暴胀模型的三个相关预测：引力波的大振幅，在视界尺度上的功率抑制和与矮星系形成相关的尺度。虽然这些预测可能是通用的模型与振荡的暴胀子潜力，轴子单值模型自然适应所需的运行光谱指数通过普朗克尺度修正的暴胀子潜力。将该模型应用于Planck、ACT、SPT和WMAP低l偏振宇宙微波背景（CMB）数据的组合数据集，我们发现由于引力波，可能已经被BICEP 2实验观测到的最佳拟合张量标量比r0.05=0.07-0.04+0.05。尽管有引力波的贡献，但大尺度上的总功率（低多极的CMB功率谱）低于标准的ΛCDM宇宙学，其初始扰动的功率谱没有引力波，因此减轻了大尺度上的一些张力。在对应于k= 10 Mpc-1的尺度上，物质功率谱也减少了20-30%，这与矮星系的形成有关。这将减轻标准ΛCDM宇宙学中一些未解决的小尺度结构问题。我们还发现，所推断的物质功率谱与最近的莱曼-α森林数据相一致，而后者与普朗克支持的具有幂律原始功率谱的ΛCDM模型相矛盾。
Author(s): Minor, QE; Kaplinghat, M | Abstract: © 2015 American Physical Society. We point out three correlated predictions of the axion monodromy inflation model: the large amplitude of gravitational waves, the suppression of power on horizon scales and on scales relevant for the formation of dwarf galaxies. While these predictions are likely generic to models with oscillations in the inflaton potential, the axion monodromy model naturally accommodates the required running spectral index through Planck-scale corrections to the inflaton potential. Applying this model to a combined data set of Planck, ACT, SPT, and WMAP low-l polarization cosmic microwave background (CMB) data, we find a best-fit tensor-to-scalar ratio r0.05=0.07-0.04+0.05 due to gravitational waves, which may have been observed by the BICEP2 experiment. Despite the contribution of gravitational waves, the total power on large scales (CMB power spectrum at low multipoles) is lower than the standard ΛCDM cosmology with a power-law spectrum of initial perturbations and no gravitational waves, thus mitigating some of the tension on large scales. There is also a reduction in the matter power spectrum of 20-30% at scales corresponding to k=10Mpc-1, which are relevant for dwarf galaxy formation. This will alleviate some of the unsolved small-scale structure problems in the standard ΛCDM cosmology. The inferred matter power spectrum is also found to be consistent with recent Lyman-α forest data, which is in tension with the Planck-favored ΛCDM model with a power-law primordial power spectrum.