标题： 确定暴胀子 显示英文标题

标题： Identifying the Inflaton

摘要： 我们探讨实验物理在揭示导致宇宙暴胀的引力拉格朗日量基本结构方面的能力。 人们普遍认为，对原初扰动的更精确测量将有助于更好地理解暴胀场的本质。 我们研究在一般暴胀拉格朗日量的框架下，这种期望在多大程度上是合理的。 我们的结论是，需要超出宇宙微波背景辐射尺度上的绝热和张量两点函数的可观测量；特别是等曲率模式，或者局部非高斯性与张量谱指数的精确测量的组合，将使最成功的重建成为可能。 我们表明，在这些可观测量中，对暴胀拉格朗日量最有力的探针是对张量谱指数的精确测量，这可能通过原初引力波的直接探测实现。 显示英文摘要

摘要： We explore the ability of experimental physics to uncover the underlying structure of the gravitational Lagrangian responsible for inflation. It is a common expectation that improved measurements of the primordial perturbations will result in a better understanding of the nature of the inflaton field. We investigate to what extent this expectation is justifiable within the context of a general inflationary Lagrangian. Our conclusion is that observables beyond the adiabatic and tensor two-point functions on CMB scales are needed; in particular, isocurvature modes or a combination of local non-Gaussiantities and a precision measurement of the tensor spectral index will enable the most successful reconstructions. We show that amongst these observables, the most powerful probe of the inflationary Lagrangian is a precision measurement of the tensor spectral index, as might be possible with a direct detection of primordial gravitational waves.