Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/03/019
Keywords
cosmology of theories beyond the SM; primordial gravitational waves (theory); quantum gravity phenomenology
Funding
- I+D grant of Spanish Ministry of Science and Innovation [FIS2017-86497-C2-2-P]
- COST Action [CA18108]
- Atraccion de Talento [2019-T1/TIC-13177]
- Japan Society for the Promotion of Science (JSPS) KAKENHI [20H01899, 20J40022]
- Grants-in-Aid for Scientific Research [20H01899, 20J40022] Funding Source: KAKEN
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Among the five cosmological quantum-gravity or quantum-gravity-inspired scenarios explored, only the non-local quantum gravity model is found to be unobservable, while the other models can achieve the strain sensitivity of DECIGO but not that of LIGO-Virgo-KAGRA, LISA or Einstein Telescope. Models with red-tilted spectra or exceptionally tiny quantum corrections are also found to be non-detectable.
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 non-local 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 with red-tilted spectra (most loop quantum cosmologies) or with exceptionally tiny quantum corrections (Wheeler-DeWitt quantum cosmology) are found to be non-detectable.
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