论文标题
原始扰动和全息宇宙学的通胀
Primordial perturbations and inflation in holographic cosmology
论文作者
论文摘要
我们考虑了全息脑的通货膨胀情况，其宇宙学流体占据了位于渐近ads $ _5 $ bumb的3+1尺寸brane。边界共形场的贡献可以表示为边界上爱因斯坦方程的修改。使用这些有效的爱因斯坦方程，我们计算宇宙学的扰动并得出相应的功率谱，假设$ k $ - essence类型的流动性。我们发现，Braneworld方案仅在声音依赖速度对慢速参数的速度下影响标量功率谱，而张量功率谱没有变化。这意味着光谱指数的变化出现在慢速参数扩展中的第二阶。
We consider an inflationary scenario in the holographic braneworld with a cosmological fluid occupying the 3+1 dimensional brane located at the holographic boundary of an asymptotic ADS$_5$ bulk. The contribution of the boundary conformal field can be represented as a modification of Einstein's equations on the boundary. Using these effective Einstein equations we calculate the cosmological perturbations and derive the corresponding power spectra assuming a general $k$-essence type of inflaton. We find that the braneworld scenario affects the scalar power spectrum only in the speed of sound dependence on the slow-roll parameters whereas there is no change in the tensor power spectrum. This implies that the changes in the spectral indices appear at the second order in the slow-roll parameter expansion.
