论文标题
在宇宙对撞机中的多个领域的散布质谱
Disentangling mass spectra of multiple fields in cosmological collider
论文作者
论文摘要
我们研究了挤压极限中多个标量域（标量等级）对膨胀双光谱的影响，特别是要注意如何解散此类磁场的质谱。我们以几乎退化的质量为例，并将其与两个等异形体的偶联为例。我们发现，与几乎变性质量相关的特征出现在双光谱的振荡部分中，该部分由波形主导，该波形的特定波长与质量差的倒数大致给出。这种具有相对较长波长的波形可以很容易地识别出来，可用于拆卸几乎变质的质谱。这种情况与地球上的对撞机实验的情况形成了鲜明的对比，在地球上，非常精确的能量分辨率与质量差异相对应才能使几乎变性的质谱分离。因此，如果将来的观察结果可以检测到原始曲率扰动的双光谱中的这种特征，则可以证明存在于哈勃尺度周围的多个颗粒并解决其质量变性。
We study effects of multiple scalar fields (scalar isocurvatons) with the Hubble scale masses on the inflationary bispectrum in the squeezed limit, particular paying attention to the question how to disentangle mass spectra of such fields. We consider two isocurvatons with almost degenerate masses and the coupling of an inflaton to both isocurvatons as an example. We find that the characteristic feature associated with nearly degenerate masses appears in the oscillating part of the bispectrum, which is dominated by a waveform with a specific wavelength roughly given by an inverse of the mass difference. Such a waveform with a relatively longer wavelength can be easily identified and useful for disentangling almost degenerate mass spectra. This situation is in sharp contrast with the case of collider experiments on earth, where the very precise energy resolution corresponding to the mass difference is required to disentangle almost degenerate mass spectra. Therefore, if future observations could detect this kind of a characteristic feature in bispectrum of the primordial curvature perturbations, it can prove the existence of degenerate multiple particles around the Hubble scale and resolve their mass degeneracies.
