论文标题
探测从大到小尺度的重力波的通货膨胀背景
Probing the inflationary background of gravitational waves from large to small scales
论文作者
论文摘要
原始引力波（PGWS）的检测是现代宇宙学最重要的目标之一，因为PGWS都可以为原始通货膨胀提供大量证据，并阐明其物理性质。对引力波（例如Ligo/处女座）以及将来的Lisa和Einstein望远镜（ET）进行的小规模实验，对重力波的随机背景敏感，可以与CMB数据一起使用以限制膨胀参数。在进行这些分析时，通常使用仅包括振幅和尺度独立倾斜的功率定律来参数张力频谱。在本文中，我们研究了将张量倾斜作为比例无关的鲁棒性。我们表明，由于CMB和GWS数据所探索的量表的巨大差异，即使是较小的依赖性也可以显着影响原始光谱的形状，可能会破坏幂律假设。当认为非线性校正被视为最终约束时，可以显着更改。我们还研究了两个不同物理模型的量表依赖性，提供了一个可忽略不计的量表依赖性的示例和不可忽略的量表依赖性的例子。
The detection of Primordial Gravitational Waves (PGWs) is one of the most important goals of modern cosmology since PGWs can both provide substantial evidence for primordial inflation and shed light on its physical nature. Small scale experiments on gravitational waves such as LIGO/VIRGO and, in future, LISA and Einstein Telescope (ET), being sensitive to the stochastic background of gravitational waves, can be used together with the CMB data to constrain the inflationary parameters. In performing these analyses the primordial tensor spectrum is usually parametrized with a power law that includes only the amplitude and a scale independent tilt. In this paper, we investigate the robustness of assuming the tensor tilt as scale independent. We show that due to the huge difference in the scales probed by CMB and GWs data, even a small scale dependence can remarkably affect the shape of the primordial spectrum possibly breaking the power-law assumption. When the non-linear corrections are considered the final constraints can be significantly changed. We also study the scale dependence in two different physical models of inflation providing an example of negligible scale dependence and an example of non-negligible scale dependence.
