Testing quantum gravity effects with latest CMB observations
Testing quantum gravity effects with latest CMB observations
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DOI：
10.1016/j.physletb.2014.06.019
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发表时间：
2014-04
影响因子：
4.4
通讯作者：
Yi-Fu Cai;Yi Wang
中科院分区：
文献类型：
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作者：
Yi-Fu Cai;Yi Wang
受量子引力物理的启发，非对易相空间方法导出了一种修正的引力波色散关系。这个特征，如果应用于非常早期的宇宙，会产生一个修改后的原始张量扰动功率谱，在大尺度上具有功率抑制。我们用BICEP 2和Planck实验来对抗这一现象，并证明了具有修正色散关系的暴胀比标准暴胀范式更能同时拟合观测结果。特别是，数值结果表明，在最新的宇宙微波背景辐射（CMB）观测下，与最小模型相比，量子引力修正的原初张量模功率谱在统计显著性上优于3σ.我们的研究表明，BICEP 2和普朗克数据之间的潜在张力可以解决量子引力效应。
Inspired by quantum gravitational physics, the approach of non-commutative (NC) phase space leads to a modified dispersion relation of gravitational waves. This feature, if applied to the very early universe, gives rise to a modified power spectrum of primordial tensor perturbations with a suppression of power on large scales. We confront this phenomenon with the BICEP2 and Planck experiments, and show that inflation with the modified dispersion relation can simultaneously fit the observations better than the standard inflationary paradigm. In particular, the numerical result implies that with the latest cosmological microwave background (CMB) observations, a quantum gravity modified power spectrum of primordial tensor modes is preferred at a statistical significance of more than 3σcompared with the minimal model. Our study indicates that the potential tension between the BICEP2 and Planck data may be resolved by quantum gravity effects.