Imprints of quantum gravity in the cosmic microwave background

Calmet, X. and Edholm, J. and Kuntz, I. (2019) Imprints of quantum gravity in the cosmic microwave background. European Physical Journal B, 79 (3): 238. ISSN 1434-6036

Abstract

It has been shown that the spectrum of quantum gravity contains at least two new modes in addition to the massless graviton: a massive spin-0 and a massive spin-2. We calculate their power spectrum during inflation and we argue that they could leave an imprint in the cosmic microwave background should their masses be below the inflationary scale.