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.
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Yong Cai was suppoerted by the China Postdoctoral Science Foundation (Grant No. 2019M650810), and the National Natural Science Foundation of China (Grant No. 11905224). YunSong Piao was supported by the National Natural Science Foundation of China (Grant Nos. 11575188, and 11690021). This work was supported by the University of Chinese Academy of Sciences.
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Cai, Y., Piao, Y. Pre-inflation and trans-Planckian censorship. Sci. China Phys. Mech. Astron. 63, 110411 (2020). https://doi.org/10.1007/s11433-020-1573-5
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DOI: https://doi.org/10.1007/s11433-020-1573-5