Non-Gaussian stochastic gravitational waves from phase transitions
Non-Gaussian stochastic gravitational waves from phase transitions
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DOI：
10.1007/jhep11(2021)107
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发表时间：
2021-02
影响因子：
5.4
通讯作者：
Soubhik Kumar;R. Sundrum;Yuhsin Tsai
中科院分区：
文献类型：
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作者：
Soubhik Kumar;R. Sundrum;Yuhsin Tsai
在原始宇宙中，宇宙相变会产生类似于宇宙微波背景辐射的各向异性随机引力波背景辐射。对于绝热扰动，GWB中的涨落遵循CMB中的涨落，但如果原始涨落携带等曲率分量，则这不再是真的。结果表明，在非最小的通货膨胀和再加热的设置，原始等曲率可以生存在GWB和表现出显着的非高斯性（NG）的CMB相比，同时遵守目前的观测范围。虽然探测这种NG GWB在丽莎上的可能性最大，但未来提出的探测器（如DECIGO和BBO）的范围要大得多。甚至有可能，与CMB或大尺度结构调查相反，可以用引力波探测器进行暴胀时代NG的首次观测。
Cosmological phase transitions in the primordial universe can produce anisotropic stochastic gravitational wave backgrounds (GWB), similar to the cosmic microwave background (CMB). For adiabatic perturbations, the fluctuations in GWB follow those in the CMB, but if primordial fluctuations carry an isocurvature component, this need no longer be true. It is shown that in non-minimal inflationary and reheating settings, primordial isocurvature can survive in GWB and exhibit significant non-Gaussianity (NG) in contrast to the CMB, while obeying current observational bounds. While probing such NG GWB is at best a marginal possibility at LISA, there is much greater scope at future proposed detectors such as DECIGO and BBO. It is even possible that the first observations of inflation-era NG could be made with gravitational wave detectors as opposed to the CMB or Large-Scale Structure surveys.