论文标题
标量调整理论中的瞬态弱重力
Transient weak gravity in scalar-tensor theories
论文作者
论文摘要
标量调整理论中的亚匹配性扰动已显示出比未耦合模型的速度更快的速度，这是由于积极的，加性的Yukawa力。在这种情况下，聚类的量比标准宇宙学模型中的量大，这加剧了$σ_8$参数中观察到的张力。相反，我们在这里表明，在某些简单的偶然耦合暗能量的情况下，人们可以在不引入幽灵或其他不稳定性的情况下获得横向Yukawa部队的短暂性政权。
Sub-horizon perturbations in scalar-tensor theories have been shown to grow generically faster than in uncoupled models due to a positive, additive Yukawa force. In such cases, the amount of clustering becomes larger than in the standard cosmological model, exacerbating the observed tension in the $σ_8$ parameter. Here we show instead that in some simple cases of conformally coupled dark energy one can obtain a transient regime of negative Yukawa force, without introducing ghosts or other instabilities.
