The inflationary paradigm is the most successful model that explains the observed spectrum of primordial perturbations. However, the precise emergence of such inhomogeneities and the quantum-to-classical transition of the perturbations has not yet reached a consensus among the community. The Continuous Spontaneous Localization model (CSL), in the cosmological context, might be used to provide a solution to the mentioned issues by considering a dynamical reduction of the wave function. The CSL model has been applied to the inflationary universe before and different conclusions have been obtained. In this letter, we use a different approach to implement the CSL model during inflation. In particular, in addition to accounting for the quantum-to-classical transition, we use the CSL model to generate the primordial perturbations, that is, the dynamical evolution provided by the CSL model is responsible for the transition from a homogeneous and isotropic initial state to a final one lacking such symmetries. Our approach leads to results that can be clearly distinguished from preceding works. Specifically, the scalar and tensor power spectra are not time-dependent, and retains the amplification mechanism of the CSL model. Moreover, our framework depends only on one parameter (the CSL parameter) and its value is consistent with cosmological and laboratory observations.
CSL Wave Function Collapse Model as a Mechanism for the Emergence of Cosmological Asymmetries in Inflation
如前所述（D）。Sudarsky，Int.J.Mod.Phys.D20：509-552，（2011）; [arXiv：0906.0315]），宇宙结构种子出现的暴胀解释不足以实际解释原始各向异性和不均匀性的产生。这种描述从对称背景出发，并调用对称动力学，因此它不能解释不对称性。为了产生不对称性，我们提出了波函数坍缩的连续自发局部化（CSL）模型的应用（P. Pearle，Phys.Rev.A39，2277，（1989）; G. C. Ghirardi，P. Pearle和A. Rimini，Phys.Rev.A42，78（1990））。量子动力学的这种修改为暴胀子场扰动的演化引入了随机非幺正分量。这导致了从均匀和各向同性阶段到另一个阶段的过渡，在这个阶段，暴胀初始状态中的量子不确定性转化为原始的不均匀性和各向异性。我们检查的要求，并说明如何实现，兼容性的精确观测的宇宙微波背景（CMB）辐射。
Quantum to Classical Transition of Inflationary Perturbations - Continuous Spontaneous Localization as a Possible Mechanism -
暴胀范式提供了一种机制来产生解释宇宙中观测到的大尺度结构所需的原始扰动。暴胀将所有的不均匀性追溯到量子涨落，尽管这些结构在今天看来是经典的。原初量子涨落的压缩和退相干机制解释了这种量子到经典跃迁的许多方面，尽管这是否足以解释量子系综实现单一结果（即宏观客观化）的问题仍然是一个争论的问题，因为宇宙是一个封闭系统。对于实验室系统，也存在宏观物体出现经典行为的类似问题，并且除了退相干之外，已经尝试通过连续自发局域化（CSL）来解决这个问题，CSL是非相对论性薛定谔方程的随机非线性修改。最近，Martin { \it et al.}研究了当Mukhanov-Sasaki变量被取为“非线性算符”时，一个具有恒定强度参数的类CSL机制是否可以解释暴胀过程中产生的原始量子微扰如何成为经典的.在他们的假设范围内，他们基本上得出了否定的结论。在目前的工作中，我们概括了他们的分析，允许CSL强度参数依赖于物理尺度，以便捕捉CSL放大机制。我们表明，这样的推广提供了一个机制的宏观客观化（即经典化）的暴胀量子微扰，同时也保持了标度不变性的功率谱和相位相干的超视界微扰模式在一个特定的类这些模型。
Reevaluation of Inflationary Dynamics in Extended General Relativity with Perturbatively and Tensorially Structured Conformal Metric
BMS College of Engineering（班加罗尔 BMS 工程学院）；Department of Physics, Faculty of Science, Islamic University of Madinah（麦地那伊斯兰大学理学院物理系）；Department of Science and Technology, University College at Nairiyah, University of Hafr Al Batin (UHB)（哈夫阿尔巴廷大学奈里亚学院科学与技术系）；Physics Department, Faculty of Science, Benha University（本哈大学理学院物理系）；Ahram Canadian University (ACU), Faculty of Engineering（阿拉姆加拿大大学工程学院）
Breaking Eternal Inflation: Empirical Viability of a Spontaneous Collapse Scenario
Universidad Nacional de La Plata（拉普拉塔国立大学）；CONICET（阿根廷国家科学研究委员会）；Università di Padova（帕多瓦大学）；INFN Sezione di Padova（意大利国家核物理研究所帕多瓦分部）；Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México（墨西哥国立自治大学核科学研究所）；Universidad de Barcelona（巴塞罗那大学）
