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arXiv 1503.01417gr-qcastro-ph.CO
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结构的起源:原始密度涨落和波函数坍缩的统计特征

Origin of structure: Statistical characterization of the primordial density fluctuations and the collapse of the wave function

Gabriel Leon, Daniel Sudarsky

摘要:

在过去的十年中,原始密度扰动的统计特性被认为是对早期宇宙物理过程的有力探索。在暴胀范式中,双谱的性质是区分关于宇宙学扰动起源细节的竞争性情景的关键之一。然而,所有的方案,基于传统的方法,所谓的“量子到经典的过渡”在通货膨胀期间,缺乏的能力,指出准确的物理机制,负责产生我们的宇宙的不均匀性和各向异性开始和完全均匀和各向同性的真空状态与早期的通货膨胀制度。在过去的工作中,我们已经表明,涉及自发动力学减少的量子态的建议提供了合理的解释说,原始的不均匀性和各向异性的诞生。在目前的手稿中,我们表明,当考虑在这种建议的背景下,频谱和双谱的表征结果是完全不同的,从那些发现在传统的方法,特别是,一些统计特征,必须以不同的方式处理,导致一些相当不同的结论。

英文摘要:

The statistical properties of the primordial density perturbations has been considered in the past decade as a powerful probe of the physical processes taking place in the early universe. Within the inflationary paradigm, the properties of the bispectrum are one of the keys that serves to discriminate among competing scenarios concerning the details of the origin of cosmological perturbations. However, all of the scenarios, based on the conventional approach to the so-called "quantum-to-classical transition" during inflation, lack the ability to point out the precise physical mechanism responsible for generating the inhomogeneity and anisotropy of our universe starting from and exactly homogeneous and isotropic vacuum state associated with the early inflationary regime. In past works, we have shown that the proposals involving a spontaneous dynamical reduction of the quantum state provide plausible explanations for the birth of said primordial inhomogeneities and anisotropies. In the present manuscript we show that, when considering within the context of such proposals, the characterization of the spectrum and bispectrum turn out to be quite different from those found in the traditional approach, and in particular, some of the statistical features, must be treated in a different way leading to some rather different conclusions.

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