论文标题
明显统一的宇宙学扰动理论
Manifestly Unitary Cosmological Perturbation Theory
论文作者
论文摘要
接下来的十年将具有丰富的新型宇宙学数据，而有关通货膨胀的许多基本问题仍然存在。鉴于此，最大程度地计算的需要，尤其是在早期宇宙的非标准场景中。在通货膨胀宇宙学中，在扰动理论的框架内计算可观察力。温伯格引入了一种现已使用的扰动理论的重组，以进行计算。温伯格（Weinberg）与传统内入的扰动系列的$iε$处方有微妙的差异，这可能会干扰对互动真空的投影。在这项工作中，我们表明对温伯格的扰动系列进行了少量调整，该系列在de Sitter Spacetime中常见研究的每一个扰动理论方面都达成了与标准的扰动理论的一致性。然后，我们将结果概括为大量的宇宙学空间，包括缓慢的滚动时间。
The next decade will feature an abundance of novel cosmological data, while many fundamental questions about inflation remain. Given this, there is ample need for maximally efficient calculations, especially in non-standard scenarios for the early Universe. In inflationary cosmology, observables are computed within the framework of in-in perturbation theory. Weinberg introduced a now-widely used re-organization of perturbation theory for in-in calculations. There is a subtle difference in the $iε$ prescriptions of Weinberg's perturbation series with traditional in-in, which could interfere with the projection onto the interacting vacuum. In this work, we show that a small adjustment to Weinberg's perturbation series yields agreement with standard in-in at every order of perturbation theory for commonly studied spins and masses in de Sitter spacetime. We then generalize the result to a large class of cosmological spacetimes, including slow roll spacetimes.
