Update of D3/D7-brane inflation on K3×T2/Z2

Update of D3/D7-brane inflation on K3×T2/Z2
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K3âT2/Z2 上 D3/D7 膜膨胀的更新

DOI:
10.1016/j.nuclphysb.2008.07.033
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发表时间:
2009
期刊:
Nuclear Physics
影响因子:
--
通讯作者:
D. Lüst
D. Lüst
中科院分区:
--
文献类型:
--
作者:
M. Haack;R. Kallosh;A. Krause;A. Linde;D. Lüst

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我们用膜和通量更新了K3 × T2/Z2上的D3/D7膜暴胀模型.为了这个目的,我们研究了低能理论,包括GS修正的Gaugino凝聚超势,稳定的K3体积模量。当原N = 2的超对称性被体通量自发破缺为N = 1时,规范动力学函数被证明是全纯的。从基本的经典N = 2超引力,该理论继承了一个移位对称性,它提供了一个自然平坦的潜在的暴胀。我们分析的命运后,列入量子校正这种转移对称性。暴胀子的场范围被发现显着依赖于环面的复杂结构,但它的体积是独立的。这允许一个大的运动场范围的暴胀子。此外,我们表明,D3/D7模型可能会导致实现最近的CMB拟合Hindmarsh等人。与11%的贡献,从宇宙弦和光谱指数接近ns = 1。另一方面,通过稍微改变模型的参数,可以强烈地抑制宇宙弦的贡献,并降低光谱指数ns,以适应WMAP 5数据在宇宙弦的情况下。我们还证明,包括量子校正允许一个制度的永恒的D3/D7通货膨胀。
We update the D3/D7-brane inflation model on K3×T2/Z2with branes and fluxes. For this purpose, we study the low energy theory including gscorrections to the gaugino condensate superpotential that stabilizes the K3 volume modulus. The gauge kinetic function is verified to become holomorphic when the original N=2 supersymmetry is spontaneously broken to N=1 by bulk fluxes. From the underlying classical N=2 supergravity, the theory inherits a shift symmetry which provides the inflaton with a naturally flat potential. We analyze the fate of this shift symmetry after the inclusion of quantum corrections. The field range of the inflaton is found to depend significantly on the complex structure of the torus but is independent of its volume. This allows for a large kinematical field range for the inflaton. Furthermore, we show that the D3/D7 model may lead to a realization of the recent CMB fit by Hindmarsh et al. with an 11% contribution from cosmic strings and a spectral index close to ns=1. On the other hand, by a slight change of the parameters of the model one can strongly suppress the cosmic string contribution and reduce the spectral index nsto fit the WMAP5 data in the absence of cosmic strings. We also demonstrate that the inclusion of quantum corrections allows for a regime of eternal D3/D7 inflation.
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