arXiv 0807.37452008-07astro-phhep-th

暴胀的微调准则和寻找原初引力波

Fine-tuning criteria for inflation and the search for primordial gravitational waves

Simeon Bird, Hiranya V. Peiris, Richard Easther

备注：: 14 pages, 20 figures, matches version published in PRD; references added
发表信息：: Phys.Rev.D78:083518,2008
DOI：: 10.1103/PhysRevD.78.083518

摘要：

我们重新讨论的论点，简单的模型的通货膨胀与一个小的红色倾斜的标量功率谱一般产生一个可观察的张量谱。我们表明，微调的基础上的潜在的代数简单性的标准强烈依赖于明确的假设，他们纳入，特别是关于通货膨胀的结束。此外，一些具有代数简单势的模型需要仔细调整初始场配置，并且并非所有类型的微调都可以通过势的代数简单性来识别。相反，在没有一个强有力的机制，结束通货膨胀之前，我们证明了存在的潜力与消失的小张量振幅，这是自然的代数形式和初始条件。因此，我们认为，建议的实验（CMBPol或BBO），使张量振幅的高灵敏度的测量不能明确排除暴胀的范式。

英文摘要：

We revisit arguments that simple models of inflation with a small red tilt in the scalar power spectrum generically yield an observable tensor spectrum. We show that criteria for fine-tuning based upon the algebraic simplicity of the potential depend strongly upon the explicit assumptions they incorporate, particularly regarding the end of inflation. In addition, some models with algebraically simple potentials require carefully tuned initial field configurations, and not all types of fine-tuning are identifiable via the algebraic simplicity of the potential. Conversely, in the absence of a strong prior on the mechanism that ends inflation, we demonstrate the existence of potentials with vanishingly small tensor amplitudes which are natural in terms of both their algebraic form and initial conditions. We thus argue that proposed experiments (CMBPol or BBO) which make highly sensitive measurements of the tensor amplitude cannot definitively rule out the inflationary paradigm.

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