Multi-field inflation from single-field models
Multi-field inflation from single-field models
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DOI：
10.1088/1475-7516/2021/08/047
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发表时间：
2020-11
影响因子：
6.4
通讯作者：
M. Bojowald;Suddhasattwa Brahma;Sean Crowe;Ding Ding-Ding;Joseph McCracken
中科院分区：
文献类型：
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作者：
M. Bojowald;Suddhasattwa Brahma;Sean Crowe;Ding Ding-Ding;Joseph McCracken
量子化意味着在经典理论中没有出现的独立自由度，由涨落，相关性和状态的高阶矩给出。在这里提出了一个系统的推导所产生的动力系统的宇宙学应用的近高斯态的单场膨胀模型。因此，单场希格斯暴胀在观测上是可行的，因为它变成了一个多场模型，具有一个特定的涨落场与暴胀子期望值相互作用的势。重要的是，半经典量子动力学的非绝热方法揭示了一些重要的阶段，这些阶段可以为慢卷暴胀（结合不确定关系）设置合适的初始条件，然后在观测上优选的e折叠数之后结束暴胀。相互作用势中的新参数来自于底层背景态的性质，展示了背景非高斯性如何影响暴胀的观测特征，或者相反，如何利用观测来理解暴胀子的量子态。
Quantization implies independent degrees of freedom that do not appear in the classical theory, given by fluctuations, correlations, and higher moments of a state. A systematic derivation of the resulting dynamical systems is presented here in a cosmological application for near-Gaussian states of a single-field inflation model. As a consequence, single-field Higgs inflation is made viable observationally by becoming a multi-field model with a specific potential for a fluctuation field interacting with the inflaton expectation value. Crucially, non-adiabatic methods of semiclassical quantum dynamics reveal important phases that can set suitable initial conditions for slow-roll inflation (in combination with the uncertainty relation), and then end inflation after the observationally preferred number of e-folds. New parameters in the interaction potential are derived from properties of the underlying background state, demonstrating how background non-Gaussianity can affect observational features of inflation or, conversely, how observations may be used to understand the quantum state of the inflaton.