We show that the observed primordial perturbations can be entirely sourced by a light spectator scalar field with a quartic potential, akin to the Higgs boson, provided that the field is sufficiently displaced from vacuum during inflation. The framework relies on the indirect modulation of reheating, which is implemented without any direct coupling between the spectator field and the inflaton and does not require non-renormalisable interactions. The scenario gives rise to local non-Gaussianity with \(f_{\mathrm{NL}}\simeq 5\) as the typical signal. As an example model where the indirect modulation mechanism is realised for the Higgs boson, we study the Standard Model extended with right-handed neutrinos. For the Standard Model running we find, however, that the scenario analysed does not seem to produce the observed perturbation.

我们表明，观察到的原始扰动可以完全来自具有四次势的光旁观标量场，类似于希格斯玻色子，前提是该场在膨胀过程中从真空中充分位移。该框架依赖于重新加热的间接调制，其实现时没有观众场和暴胀子之间的任何直接耦合，并且不需要不可重整化的交互。该场景会产生\(f_{\mathrm{NL}}\simeq 5\) 的局部非高斯性作为典型信号。作为实现希格斯玻色子间接调制机制的示例模型，我们研究了用右手中微子扩展的标准模型。然而，对于标准模型运行，我们发现所分析的场景似乎并没有产生观察到的扰动。