Abstract
Abstract
At momenta much higher than the Hubble scale, the cosmological expansion can be thought of as a weak gravitational field. We consider QFT in a particularly convenient set of coordinates that makes this manifest, so that, for those high momenta, the effects of the cosmological expansion can be dealt with using the standard tools of perturbation theory in Minkowski space. In this way, we re-derive standard results of QFT in a cosmological background, such as mode-stretching and gravitational particle production. We discuss the implications of our results for the trans-Planckian problem.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference16 articles.
1. J. Martin and R.H. Brandenberger, The Trans-Planckian problem of inflationary cosmology, Phys. Rev. D 63 (2001) 123501 [hep-th/0005209] [INSPIRE].
2. A. Bedroya, R. Brandenberger, M. Loverde and C. Vafa, Trans-Planckian Censorship and Inflationary Cosmology, Phys. Rev. D 101 (2020) 103502 [arXiv:1909.11106] [INSPIRE].
3. S. Weinberg, Lectures on Quantum Mechanics, Cambridge University Press, Cambridge, U.K. (2005).
4. C.P. Burgess, S.P. de Alwis and F. Quevedo, Cosmological Trans-Planckian Conjectures are not Effective, JCAP 05 (2021) 037 [arXiv:2011.03069] [INSPIRE].
5. J. Polchinski, String Theory and Black Hole Complementarity, hep-th/9507094.