Table of Contents
Universe, Volume 5, Issue 1 (January 2019)
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Cover Story (view full-size image) The ability to reproduce the observed matter power spectrum P(k) to high accuracy has long been [...] Read more. The ability to reproduce the observed matter power spectrum P(k) to high accuracy has long been considered a triumph of inflation. Here, we explore an alternative, and arguably more natural, explanation for P(k) based purely on quantum field theory methods and Einstein's gravity, without the usual assumptions implicit in inflation models. Although quantum gravity is notorious for being perturbatively nonrenormalizable, nonperturbative methods can be applied in deriving results such as anomalous scaling dimensions. We then show how the full P(k) can be reproduced without inflation and, in the end, agrees quite well with current galaxy and CMB data. New testable predictions within this picture deviate significantly from the conventional inflation picture and should become verifiable in the near future using increasingly accurate satellite measurements. View this paper.