Imprints of Quantum Gravity in the Cosmic Microwave Background
arXiv:1903.01379 · doi:10.1140/epjc/s10052-019-6756-x
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.