Gianluca Calcagni - Stochastic gravitational-wave background in quantum gravity

QGRAV2021
International Workshop on Quantum Gravity, Higher Derivatives & Nonlocality
8th to 12th March 2021

Abstract: Among all cosmological quantum-gravity or quantum-gravity inspired scenarios, only very few predict a blue-tilted primordial tensor spectrum. We explore five of them and check whether they can generate a stochastic gravitational-wave background detectable by present and future interferometers: non-local quantum gravity, string-gas cosmology, new ekpyrotic scenario, Brandenberger-Ho non-commutative inflation and multi fractional spacetimes. We show that nonlocal quantum gravity is unobservable, while all the other models can reach the strain sensitivity of DECIGO but not that of LIGO-Virgo-KAGRA, LISA or Einstein Telescope. Other quantum-gravity models are found to be non-detectable.
Based on arXiv:2012.00170

[quantumofspace]

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