Pre-inflation and Trans-Planckian Censorship
Abstract
We investigate the implication of Trans-Planckian Censorship Conjecture (TCC) for the initial state of primordial perturbations. It is possible to set the state of perturbation modes in the infinite past as the Minkowski vacuum, only if the pre-inflationary era is past-complete. We calculate the evolution of the perturbation modes in such a pre-inflationary era and show that at the beginning of inflation the perturbation modes with wavelengths much shorter than the Hubble scale (but still larger than the Planck length scale) will behave as they are in the Bunch-Davis state. Therefore, a past-complete pre-inflationary evolution may automatically prepare the initial state required for the inflationary perturbations at the CMB window while obeying the TCC.
Keywords
Cite
@article{arxiv.1909.12719,
title = {Pre-inflation and Trans-Planckian Censorship},
author = {Yong Cai and Yun-Song Piao},
journal= {arXiv preprint arXiv:1909.12719},
year = {2020}
}
Comments
22 pages, 4 figures; references added; updated to match published version