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arXiv 1102.1917hep-thastro-ph.COhep-ph
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与物质耦合的k-暴胀中的微扰理论

Perturbation Theory in k-Inflation Coupled to Matter

Philippe Brax, Emeline Cluzel

摘要:

我们考虑k-暴胀模型的行动是一个非线性函数的inflaton和inflaton动力学项。我们专注于标量张量扩展的k-通货膨胀耦合到物质,我们推导出一个修改后的Mukhanov-Sasaki方程的曲率扰动。当耦合函数沿暴胀轨道突然改变时,功率谱会出现显著的修正。这引起了修改Starobinsky模型的扰动功能。我们分析的方式功率谱是改变在红外线时,这些功能存在。

英文摘要:

We consider k-inflation models where the action is a non-linear function of both the inflaton and the inflaton kinetic term. We focus on a scalar-tensor extension of k-inflation coupled to matter for which we derive a modified Mukhanov-Sasaki equation for the curvature perturbation. Significant corrections to the power spectrum appear when the coupling function changes abruptly along the inflationary trajectory. This gives rise to a modification of Starobinsky's model of perturbation features. We analyse the way the power spectrum is altered in the infrared when such features are present.

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