超哈勃对因果涨落抑制的探测极限
Detection Limits for Super-Hubble Suppression of Causal Fluctuations
摘要：
我们调查在何种程度上未来的微波背景实验可能能够检测到的波动功率在大尺度上的平坦和开放的宇宙模型的抑制。如果波动是由因果过程产生的，那么这种抑制就会出现，并且对于暴胀模型来说，测量小的抑制尺度会有问题，但与许多缺陷模型一致。更有推测性的是，对当前哈勃半径量级的抑制尺度的测量可以为导致低密度宇宙的微调暴胀模型提供独立的证据。我们发现，根据原始的功率谱，抑制规模适度大于可见地平线可以检测到，但可检测性下降非常迅速，随着规模的增加。对于具有两个通货膨胀期的模型，基本上不可能检测到因果抑制尺度。
英文摘要：
We investigate to what extent future microwave background experiments might be able to detect a suppression of fluctuation power on large scales in flat and open universe models. Such suppression would arise if fluctuations are generated by causal processes, and a measurement of a small suppression scale would be problematic for inflation models, but consistent with many defect models. More speculatively, a measurement of a suppression scale of the order of the present Hubble radius could provide independent evidence for a fine-tuned inflation model leading to a low-density universe. We find that, depending on the primordial power spectrum, a suppression scale modestly larger than the visible Horizon can be detected, but that the detectability drops very rapidly with increasing scale. For models with two periods of inflation, there is essentially no possibility of detecting a causal suppression scale.
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