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arXiv 1708.09736gr-qcastro-ph.COhep-th
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微粒慢卷膨胀

Corpuscular slow-roll inflation

Roberto Casadio, Andrea Giugno, Andrea Giusti

摘要:

我们表明,引力的微粒描述可以导致类似于Starobinsky模型的暴胀场景,而不需要引入暴胀子场。所有相关的性质都由宇宙凝聚体中引力子的数量决定,或者等价地,由它们的康普顿长度决定。特别地,哈勃参数$H$与膨胀末期CMB观测所需的时间导数$\dot H$之间的关系,以及慢滚参数的(最小)初始值,都可以由凝聚体的康普顿尺寸自然地得到。

英文摘要:

We show that a corpuscular description of gravity can lead to an inflationary scenario similar to Starobinsky's model without requiring the introduction of the inflaton field. All relevant properties are determined by the number of gravitons in the cosmological condensate or, equivalently, by their Compton length. In particular, the relation between the Hubble parameter $H$ and its time derivative $\dot H$ required by CMB observations at the end of inflation, as well as the (minimum) initial value of the slow-roll parameter, are naturally obtained from the Compton size of the condensate.

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