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arXiv 1306.4914hep-thastro-ph.COgr-qchep-ph
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高能尺度暴胀模型与Planck模型的协调

Reconciliation of High Energy Scale Models of Inflation with Planck

Amjad Ashoorioon, Konstantinos Dimopoulos, M. M. Sheikh-Jabbari, Gary Shiu

摘要:

暴胀宇宙学范式在解释CMB各向异性到百分比水平上是非常成功的。除了依赖于暴胀模型外,CMB温度涨落的功率谱、谱倾斜和非高斯性也依赖于暴胀的初始状态。在这里,我们检查在多大程度上这些可观的影响,我们的无知,在初始条件的暴胀扰动,由于未知的新物理在高尺度$M$。对于满足反作用约束的初始状态,我们发现功率谱的幅度仍然可以显着改变,而双谱的修改仍然很小。对于这样的初始状态,$M$具有几十个$H$的上限,其中$H$是膨胀期间的哈勃参数。我们发现,对于$M\sim 20 H$,这样的初始状态总是(基本上)抑制张量标量比。特别是,我们表明,一般的初始条件的选择可以令人满意地调和简单的$1/2 m^2 ϕ^2$混沌模型与普朗克数据。

英文摘要:

The inflationary cosmology paradigm is very successful in explaining the CMB anisotropy to the percent level. Besides the dependence on the inflationary model, the power spectra, spectral tilt and non-Gaussianity of the CMB temperature fluctuations also depend on the initial state of inflation. Here, we examine to what extent these observables are affected by our ignorance in the initial condition for inflationary perturbations, due to unknown new physics at a high scale $M$. For initial states that satisfy constraints from backreaction, we find that the amplitude of the power spectra could still be significantly altered, while the modification in bispectrum remains small. For such initial states, $M$ has an upper bound of a few tens of $H$, with $H$ being the Hubble parameter during inflation. We show that for $M\sim 20 H$, such initial states always (substantially) suppress the tensor to scalar ratio. In particular we show that a general choice of initial conditions can satisfactorily reconcile the simple $1/2 m^2 ϕ^2$ chaotic model with the Planck data.

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