Scale invariance without inflation
Scale invariance without inflation
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DOI：
10.1088/1475-7516/2003/12/002
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发表时间：
2003-07
影响因子：
6.4
通讯作者：
C. Armendáriz-Picón;Eugene A. Lim
中科院分区：
文献类型：
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作者：
C. Armendáriz-Picón;Eugene A. Lim
我们提出了一种新的替代机制来播种不依赖于通货膨胀的原始密度扰动的尺度不变谱。在我们的设想中，完美的流体在膨胀的非膨胀宇宙的早期阶段占主导地位。由于流体的声速衰减，扰动被冻结在声层后面，其谱指数取决于流体状态方程。我们在这里探索一个实现这个想法的玩具模型。尽管该模型可以解释原初扰动的绝热、高斯、尺度不变谱，但事实证明，以其最简单的形式，它无法解释观测到的原初密度扰动的幅度。
We propose a new alternative mechanism to seed a scale invariant spectrum of primordial density perturbations that does not rely on inflation. In our scenario, a perfect fluid dominates the early stages of an expanding, non-inflating universe. Because the speed of sound of the fluid decays, perturbations are left frozen behind the sound horizon, with a spectral index that depends on the fluid equation of state. We explore here a toy model that realizes this idea. Although the model can explain an adiabatic, Gaussian, scale invariant spectrum of primordial perturbations, it turns out that in its simplest form it cannot account for the observed amplitude of the primordial density perturbations.