论文标题
来自模量稳定的亚电势DE Sitter真空的充气
Inflation near a metastable de Sitter vacuum from moduli stabilisation
论文作者
论文摘要
我们研究了在存在三个D7-Brane堆栈的IIB通量压缩框架中，在三个D7-Brane堆栈的框架中获得的亚稳态DE Sitter真空吸尘器的宇宙学特性，基于在世界折叠和字符串环路上的扰动量子校正，这些量子在大体积和较弱的辅助上都占主导地位。在最简单的情况下，该模型具有一个有效参数，该参数控制着用体积模量识别的充气电势的形状。该模型为参数的值提供了现象学成功的小场膨胀，该值使最小值非常浅且接近最大值。地平线出口接近拐点，而宇宙膨胀的大多数E折叠的大部分是在最小值附近产生的，并且预测了张量与量表与量表原始波动的比率$ r \ sim 4 \ sim 4 \ times 10^{ - 4} $。尽管它的肤浅，但最低限度实际上是稳定的。我们表明，它只能通过霍金·莫斯instanton腐烂，导致衰减率极长。显然，为了结束通货膨胀并获得现实的模型，最低限度需要新的低能物理学，以$ 10^{12} $ GEV的中间能量尺度。有吸引力的可能性是在混合膨胀框架内引入“瀑布”场。
We study the cosmological properties of a metastable de Sitter vacuum obtained recently in the framework of type IIB flux compactifications in the presence of three D7-brane stacks, based on perturbative quantum corrections at both world-sheet and string loop level that are dominant at large volume and weak coupling. In the simplest case, the model has one effective parameter controlling the shape of the potential of the inflaton which is identified with the volume modulus. The model provides a phenomenological successful small-field inflation for a value of the parameter that makes the minimum very shallow and near the maximum. The horizon exit is close to the inflection point while most of the required e-folds of the Universe expansion are generated near the minimum, with a prediction for the ratio of tensor-to-scalar primordial fluctuations $r \sim 4 \times 10^{-4}$. Despite its shallowness, the minimum turns out to be practically stable. We show that it can decay only through the Hawking-Moss instanton leading to an extremely long decay rate. Obviously, in order to end inflation and obtain a realistic model, new low-energy physics is needed around the minimum, at intermediate energy scales of order $10^{12}$ GeV. An attractive possibility is by introducing a "waterfall"' field within the framework of hybrid inflation.
