Imprints of Quantum Gravity in the Cosmic Microwave Background

Published 4 Mar 2019 in hep-th and gr-qc | (1903.01379v1)

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.

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