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arXiv 1709.06237astro-ph.CO
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用当前数据约束量子坍缩暴胀模型:半经典方法

Constraining quantum collapse inflationary models with current data: The semiclassical approach

María Pía Piccirilli, Gabriel León, Susana J. Landau, Micol Benetti, Daniel Sudarsky

摘要:

暴胀子波函数的自致坍缩假设被引入作为负责在所有尺度上出现非均匀性和各向异性的物理过程的候选者。特别地,我们考虑了暴胀子波函数动力学精确形式的不同方案:i)基于自发个体坍缩的GRW型坍缩方案,它产生各种物理量的非零期望值,作为标准暴胀方案的修正; ii)基于暴胀子波函数的薛定谔演化的连续自发局域化(CSL)型修改的建议,基于坍缩算子的自然选择。我们进行了系统的分析,在半经典重力近似下,考虑一个完整的准德西特膨胀的情况下,这些模型的立场。我们注意到,对宇宙微波背景(CMB)温度和偏振谱的预测与标准宇宙学模型略有不同。我们还分析了这些建议与贝叶斯模型比较,使用最近的CMB和重子声振荡(BAO)的数据。我们的研究结果表明,联合CMB和BAO数据的一个研究的崩溃计划模型比$Λ$ CDM一个中等的偏好,而没有偏好时,只考虑CMB数据。此外,使用CMB数据的分析为CSL和标准模型提供了相同的贝叶斯证据,即数据在LCDM模型的简单性和崩溃情景的复杂性之间没有偏好。

英文摘要:

The hypothesis of the self-induced collapse of the inflaton wave function was introduced as a candidate for the physical process responsible for the emergence of inhomogeneity and anisotropy at all scales. In particular, we consider different proposal for the precise form of the dynamics of the inflaton wave function: i) the GRW-type collapse schemes proposals based on spontaneous individual collapses which generate non-vanishing expectation values of various physical quantities taken as ansatz modifications of the standard inflationary scenario; ii) the proposal based on a Continuous Spontaneous Localization (CSL) type modification of the Schrödinger evolution of the inflaton wave function, based on a natural choice of collapse operator. We perform a systematic analysis within the semi-classical gravity approximation, of the standing of those models considering a full quasi-de sitter expansion scenario. We note that the predictions for the Cosmic Microwave Background (CMB) temperature and polarization spectrum differ slightly from those of the standard cosmological model. We also analyse these proposals with a Bayesian model comparison using recent CMB and Baryonic Acoustic Oscillations (BAO) data. Our results show a moderate preference of the joint CMB and BAO data for one of the studied collapse schemes model over the $Λ$CDM one, while there is no preference when only CMB data are considered. Additionally, analysis using CMB data provide the same Bayesian evidence for both the CSL and standard models, i.e. the data have not preference between the simplicity of the LCDM model and the complexity of the collapse scenario.

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