Stochastic gravitational-wave background in quantum gravity
Stochastic gravitational-wave background in quantum gravity
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DOI：
10.1088/1475-7516/2021/03/019
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发表时间：
2020-11
影响因子：
6.4
通讯作者：
G. Calcagni;S. Kuroyanagi
中科院分区：
文献类型：
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作者：
G. Calcagni;S. Kuroyanagi
在所有的宇宙学量子引力或量子引力启发的情景中，只有极少数人预测会出现蓝倾斜的原始张量谱。我们探索了其中的五个，并检验了它们是否能够产生一个现在和未来的干涉仪可以探测到的随机引力波背景：非局域量子引力、弦气体宇宙学、新的热解情景、Brandenberger-Ho非对易暴胀和多分数时空。我们发现非局域量子引力是不可观测的，而所有其他模型都能达到DECIGO的应变灵敏度，但不能达到LIGO-Virgo-KAGRA，LISA或爱因斯坦望远镜的应变灵敏度。其他具有红色倾斜光谱的量子引力模型(大多数环形量子宇宙学)或具有异常微小的量子修正(惠勒-德维特量子宇宙学)的量子引力模型被发现是不可探测的。
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.