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arXiv 1405.0197hep-thastro-ph.COhep-ph
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无标度超引力中的弦模镇定混沌暴胀

Chaotic Inflation in No-Scale Supergravity with String Inspired Moduli Stabilization

Tianjun Li, Zhijin Li, Dimitri V. Nanopoulos

摘要:

简单的混沌暴胀与BICEP 2实验高度一致,无标度超引力可以在各种弦紧化中自然实现。因此,我们从U(1)X规范对称的IIB型弦紧化出发,构造了一个无标度超引力中的混沌暴胀模型。我们引入了在U(1)_X下非平凡变换的两个模T_1和T_2,以及在SU(N)x U(1)_X规范群下带电的基本夸克对。模在U(1)_X下的非平凡变换导致一个模依赖的Fayet-Iliopoulos(FI)项。夸克凝聚的非微扰效应和U(1)_XD项稳定了模T_2和T_1的实分量。特别地,反常U(1)_XD项与模相关FI项的稳定化对暴胀是至关重要的,因为它赋予模T_1的实部以重质量,同时保持其轴子部分轻。通过选取适当的参数,我们得到了一个全局Minkowski真空,其中T_1的虚部具有二次混沌暴胀势。

英文摘要:

The simple chaotic inflation is highly consistent with the BICEP2 experiment, and no-scale supergravity can be realized naturally in various string compactifications. Thus, we construct a chaotic inflation model in no-scale supergravity inspired from Type IIB string compactification with an anomalous U(1)_X gauged symmetry. We introduce two moduli T_1 and T_2 which transform non-trivially under U(1)_X, and some pairs of fundamental quarks charged under the SU(N) x U(1)_X gauge group. The non-trivial transformations of moduli under U(1)_X lead to a moduli-dependent Fayet-Iliopoulos (FI) term. The modulus T_2 and the real component of T_1 are stabilized by the non-perturbative effect from quark condensation and the U(1)_X D-term. In particular, the stabilization from the anomalous U(1)_X D-term with moduli-dependent FI term is crucial for inflation since it gives heavy mass to the real component of the modulus T_1 while keeping its axionic part light. Choosing the proper parameters, we obtain a global Minkowski vacuum where the imaginary part of T_1 has a quadratic potential for chaotic inflation.

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