Slow-roll trajectories in Chromo-Natural and Gauge-flation Models, an exhaustive analysis
Slow-roll trajectories in Chromo-Natural and Gauge-flation Models, an exhaustive analysis
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色度自然和计量膨胀模型中的慢滚轨迹，详尽的分析
DOI：
10.1103/physrevd.88.043509
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Moslem Zarei
中科院分区：
文献类型：
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作者：
A. Maleknejad;Moslem Zarei
在宇宙学中，扰动范型是当今早期宇宙学的主要框架，它解决了视界和宇宙性等古老的宇宙学难题，并提供了产生宇宙扰动的自然机制。然而，尽管它在现象学上取得了许多成功，但它也面临着一些理论上的挑战。文献中大多数成功的非平衡模型都是基于使用一个或多个具有足够大势能的标量场来保证慢卷条件并导致足够数量的e折叠，另一方面，如果没有提供一致的高能理论设置，那么这种极端的势能一般不会受到量子修正的保护，除非我们对系统进行高度微调。这个理论上的问题，即所谓的η问题，已经驱使许多学者避免对势进行微调。第一次使用在自然现象[1，2]，一个可能的解决方案是在自然现象中的双轴场。事实上，由于轴子场具有精确的余弦型势，它不会受到任何微扰量子修正。然而，为了使慢滚加速成功，在这个模型中，轴子衰变常数f必须很大（f ∈ M
Inflation paradigm is the main framework for the earlyuniverse cosmology today which solves the old cosmo-logical puzzles such as horizon and flatness problems aswell as providing a natural mechanism for generating cos-mic perturbations. Despite of its many phenomenologicalsuccesses, however, inflation faces some theoretical chal-lenges. Most of the successful inflationary models in theliterature are based on using one or more scalar fieldswith a sufficiently flat potential to guarantee the slow-roll condition and leads to enough number of e-foldings.On the other hand, without providing a consistent highenergy theory setting, such extremely flat potentials gen-erally is not protected against the quantum correctionsunless we highly fine-tuned the system. This theoreticalconcern, the so-called η-problem, has driven many effortsto avoid fine-tuning in the potential. First used in Nat-ural Inflation [1, 2], one possible solution is consideringaxion fields as inflaton. In fact, since the axion field has aperturbatively exact cosine-type potential, it would notreceived any perturbative quantum corrections. How-ever, in order to have a successful slow-roll inflation, theaxion decay constant f should be very large in this model(f∼ M