论文标题
来自宇宙域壁的随机重力波背景的大型各向异性
Large anisotropies of the stochastic gravitational wave background from cosmic domain walls
论文作者
论文摘要
我们研究了宇宙域壁（DWS）的随机重力背景（SGWB），这是由于通货膨胀期间光量表域$ ϕ $的量子波动引起的。离开哈勃地平线后，$ ϕ $的扰动几乎保持恒定。这两个域的概率取决于每个大规模区域的平均值$ ϕ $，从而导致SGWB中DW能量密度和大型各向异性的大规模扰动。我们发现，角功率谱是比例不变的，至少是$ 10^{ - 2} $的顺序，预计将通过未来的重力波（GW）检测器检测到。由于我们尚未检测到原始GWS，因此SGWB的各向异性可以帮助我们验证通货膨胀的合理性并确定通货膨胀的能量尺度。
We investigate the stochastic gravitational wave background (SGWB) from cosmic domain walls (DWs) caused by quantum fluctuations of a light scalar field $ϕ$ during inflation. Perturbations of $ϕ$ remain almost constant after leaving the Hubble horizon. The probabilities of the two domains depend on the averaged value of $ϕ$ at each large scale region, leading to large scale perturbations of DW energy density and large anisotropies in the SGWB. We find that the angular power spectrum is scale-invariant and at least of the order of $10^{-2}$, which is expected to be detected by future gravitational-wave (GW) detectors. Since we have not detected primordial GWs yet, anisotropies of the SGWB could help us to verify the rationality of inflation and determine the energy scale of inflation.
