Duality invariance of cosmological perturbation spectra
Duality invariance of cosmological perturbation spectra
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DOI：
10.1103/physrevd.60.023507
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发表时间：
1998-09
影响因子：
5
通讯作者：
D. Wands
中科院分区：
文献类型：
--
作者：
D. Wands
I show that cosmological perturbation spectra produced from quantum fluctuations in massless or self-interacting scalar fields during an inflationary era remain invariant under a two parameter family of transformations of the homogeneous background fields. This relates slow-roll inflation models to solutions which may be far from the usual slow-roll limit. For example, a scale-invariant spectrum of perturbations in a minimally coupled, massless field can be produced by an exponential expansion with $a\ensuremath{\propto}{e}^{\mathrm{Ht}},$ or by a collapsing universe with $a\ensuremath{\propto}(\ensuremath{-}{t)}^{2/3}.$
