Horizon-preserving dualities and perturbations in non-canonical scalar field cosmologies
Horizon-preserving dualities and perturbations in non-canonical scalar field cosmologies
复制标题
非正则标量场宇宙学中的视界保持对偶性和扰动
DOI：
10.1088/1475-7516/2012/02/015
复制
发表时间：
2011
影响因子：
6.4
通讯作者：
A. M. Dizgah
中科院分区：
文献类型：
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作者：
G. Geshnizjani;W. Kinney;A. M. Dizgah
我们推广的宇宙学之间的通货膨胀和循环收缩的互换下的ParticiH的情况下，非正则标量场理论与不同的声速。典型情况下的单个对偶性可以推广到三个对偶性的家族，这些对偶性是为了保持宇宙学声视界不变而构建的。我们发现三类模型：（I）DBI膨胀，（II）循环收缩的非正则推广，和（III）一个新的宇宙学解决方案，快速下降的声速和相对缓慢增长的比例因子，我们称之为停滞宇宙学。我们构造的膨胀慢滚近似的对偶类似物，并解决在所有三种情况下的曲率扰动。周期性收缩和停滞宇宙学都预测了与观测不一致的曲率扰动的强烈蓝色光谱。
We generalize the cosmological duality between inflation and cyclic contraction under the interchange a↔H to the case of non-canonical scalar field theories with varying speed of sound. The single duality in the canonical case generalizes to a family of three dualities constructed to leave the cosmological acoustic horizon invariant. We find three classes of models: (I) DBI inflation, (II) the non-canonical generalization of cyclic contraction, and (III) a new cosmological solution with rapidly decreasing speed of sound and relatively slowly growing scale factor, which we dub stalled cosmology. We construct dual analogs to the inflationary slow roll approximation, and solve for the curvature perturbation in all three cases. Both cyclic contraction and stalled cosmology predict a strongly blue spectrum for the curvature perturbations inconsistent with observations.