标题： 量子引力中的随机引力波背景 显示英文标题

标题： Stochastic gravitational-wave background in quantum gravity

摘要： 在所有宇宙学量子引力或受量子引力启发的场景中，只有极少数预测了蓝倾斜的原初张量谱。 我们研究了其中五种，并检查它们是否能产生可被当前和未来干涉仪检测到的随机引力波背景：非局部量子引力、弦气体宇宙学、新热大爆炸场景、Brandenberger-Ho 非对易膨胀和多分数时空。 我们表明非局部量子引力是不可观测的，而其他所有模型都能达到DECIGO的应变灵敏度，但达不到LIGO-Virgo-KAGRA、LISA或爱因斯坦望远镜的灵敏度。 其他具有红倾斜光谱的量子引力模型（大多数环量子宇宙学）或具有异常微小量子修正的模型（Wheeler-DeWitt量子宇宙学）被发现是不可检测的。 显示英文摘要

摘要： 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.