非均匀相变引起的宇宙学扰动
Cosmological perturbations from an inhomogeneous phase transition
摘要：
本文讨论了暴胀模型中产生度规扰动的一种机制。在退耦扇区中，光标量场的长波长不均匀性会引起低能有效作用量中耦合和质量的超视界涨落。宇宙学上的相变可能会在空间中不同时发生，但在不同的哈勃斑片中会有时间滞后，这是由长波长的不均匀性引起的。这里考虑了一个有趣的模型，其中宇宙学扰动可能在电弱相变中产生。结果表明，相变可能是非高斯性的一般来源。
英文摘要：
A mechanism for generating metric perturbations in inflationary models is considered. Long-wavelength inhomogeneities of light scalar fields in a decoupled sector may give rise to superhorizon fluctuations of couplings and masses in the low-energy effective action. Cosmological phase transitions may then occur that are not simultaneous in space, but occur with time lags in different Hubble patches that arise from the long-wavelength inhomogeneities. Here an interesting model in which cosmological perturbations may be created at the electroweak phase transition is considered. The results show that phase transitions may be a generic source of non-Gaussianity.
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